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Child actor Brett Ambler, aka The Kazoo Kid, was only 5 years old when he starred in the kazoo sing-along/play-along video -- which featured a young boy (Brett) playing the kazoo to his audience, later giving him the confidence to play, sing and dance with the other kids -- back in 1989.

After being uploaded to YouTube in 2011 ... the classic video resurfaced and several techno remixes were shared to SoundCloud, increasing Brett's popularity. The sing-along also brought in a couple million views on Facebook, and The Kazoo Kid's meme went viral!

"And you too can kazoo!"

American social media personality Alli Fitz (aka 'AlliCattt') was 19 years old when she first started going viral on the short-form video platform "Vine" back in 2013 -- known for her entertaining and cheeky videos which grabbed her a whopping 4.3 million followers and nearly 3 billion loops.

Prior to her days on Vine, she started posting YouTube content back in 2008 -- her first upload being a Happy Birthday video for her idol Joe Jonas -- followed by song covers like Taylor Swift's "Forever And Always."

Her popularity has landed her sought-after gigs in the entertainment biz with major companies like MTV and Universal Records, and most recently she's been busy making music!

Blueface and UK bad boy TikToker Ed Matthews are fighting in a week ... and the social media star from across the pond isn't looking to put in a full night's work -- he says he'll starch the American rapper in the first round!

TMZ Sports talked to 19-year-old Matthews earlier in the week ... just days after the bout was added to the Kingpyn Boxing card, going down April 22 at OVO Arena Wembley in London, Ed's home turf.

"It's a big fight, obviously a lot's on the line. Last minute, as well. Usually I'd be in a 6-week camp, but it's been a 2-week camp. Not that that's gonna change anything. I'll still have the same gameplan," Matthews told us.

But, that doesn't mean he isn't ready to go ... Ed, who's 1-0 in the boxing ring, says he's not only in the "best shape" of his life but, "I'm definitely the best I've ever been."

26-year-old, 6'3" tall Blueface has experience in the ring, too, but Ed says it won't matter.

"It's a first-round knockout, I've already seen it, trust me."

Matthews says he's actually a fan of Blueface, and admitted while it's likely the rapper doesn't know who he is, he will soon enough.

"It's weird actually because I used to listen to his tunes, but I feel like he fell off from the music scene a bit. I ain't heard any of his tunes in a sec, but they used to bang. it's weird, it's a bit nostalgic fighting him," Ed said.

"He definitely don't have a f****** clue who I am, but he's gonna!"

Asian Doll is slamming the highly-controversial YouTube documentary that labels the late King Von a real-life "Terminator" ... and also features footage of the female rapper, who dated Von.

On Friday, AD lashed out at the presentation labeled "King Von: Rap's First Serial Killer" ... a 3-hour exposé that alleges Von was responsible for committing 10 murders in his lifetime.

Asian Doll angrily tweeted Friday morning at random viewers of the doc, as well as the guy who produced it ... Trap Lore Ross, who's a UK-based blogger. His YouTube channel specializes in covering drill rappers by using social media and news clippings.

The video originally premiered on YouTube on April 7, but Ross says the platform took it down due to multiple issues with the content.

He says he blurred out all the guns and drug paraphernalia, and switched up a few of his theories to appease YouTube censors ... and it's back up now.

Von was killed in 2020, so he's obviously not around to defend his name -- but Asian Doll's clearly not approving ... even with Ross' edited version.

The romance between Jake Paul and Jutta Leerdam has taken the next step -- the two are now IG official!!

The Dutch speed skater posted three pics of her and the YouTuber-turned-star-boxer in announcing their relationship status ... one of which showed the two holding hands on a boat.

Jake, meanwhile, threw up two photos of the couple on recent dates ... confirming their relationship as well.

"Im Dutch now," Paul wrote in his caption.

"That's it," Jutta said in hers.

Paul also shared a snap of the two on his IG stories Monday -- showing the couple cuddled up on a beach somewhere.

Of course, Paul was most recently linked to model Julia Rose until last year ... and Jutta previously dated fellow speed skater Koen Verweij.

We broke the story, 26-year-old Paul and 24-year-old Leerdam were spotted kissing on a dinner date in Miami last month ... but it was unclear if it was anything more than just two, hot young people enjoying each other's company.

Seems we've now got our answer ... and we're here for all of it!

Logan Paul just took a big loss to Seth "Freakin'" Rollins at WrestleMania on Saturday ... and even with the Maverick's former foe, KSI, making a surprise appearance, it wasn't enough for the social media superstar to get the W.

The whole match was entertainment at its finest ... and the crowd and broadcasters were into the madness from the very beginning.

"Logan proved once again he deserved to be in there with one of the promotion's biggest stars ... and even the announcers stated it was surprising Rollins was having a fight with the 'social media star,'" the broadcast said.

Logan seemingly won the match when he appeared to knock Rollins out cold ... but it simply wasn't enough to secure the win. Seth got back up and responded with some fierce shots of his own ... just to have KSI, Paul's former nemesis-turned-business partner, shock the world by revealing himself in a Prime mascot bottle and entering himself in the bout.

But, it wasn't as it seemed -- as Logan accidentally crushed KSI from the top ropes when he tried to slam Seth Rollins into the announcer's table.

Eventually, Seth got the better of Logan, hitting him with his signature curb stomp finisher -- then pinning him in the middle of the ring ... as 80,000+ fans screamed.

Logan has proven time and again he is way more than that -- and he silenced any remaining doubters with his performance at SoFi Stadium on Saturday ... which also just so happened to be his 28th birthday.

YouTube star Colleen Ballinger, best known for her Internet character Miranda Sings, is laughing all the way to the bank ... after selling her L.A. home for more than $3 mil!

Real estate sources tell TMZ ... the YouTuber/comedian unloaded her 5,000-square-foot Encino home for $3.4 million. The 5-bedroom, 5.5-bathroom pad sits on a 9,000-square-foot lot ... and it has a whole lot to offer.

The house has high ceilings, which is always awesome, and lots of natural light. It's not only got a kitchen, but a butler's pantry as well.

The primary suite has its own fireplace, outdoor terrace, walk-in closet and spa-like bath.

The backyard is cool ... a built-in BBQ center and a "cigar patio" with a fireplace. Of course, there's the obligatory pool.

Colleen listed the home back in January for $3.75 million after moving her and her fam to Santa Barbara.

Behind this cleft chin cutout is an Internet personality who enjoys handing out Lamborghinis and stacks of cash. As a guy who's always on the go, it's a good thing he's got his childhood bestie -- and now president of his brand -- Natalie Mariduena to help run the show!

From his OG days on Vine to his lucrative days on YouTube, this pizza lover has definitely made a pretty penny off his content creations, leveraging his earnings into various business ventures like a phone app and a restaurant.

Le'Veon Bell is channeling his inner Rocky in preparation for his next fight ... getting in an insane ab workout this week that looked more like torture than a typical sweat sesh.

The former NFL superstar is boxing YouTuber JMX in April ... and he's clearly taking it seriously, 'cause check out footage of the work he got in at the gym on Wednesday -- it's intense.

The ex-running back -- who quit football in 2022 to focus on his boxing career -- laid on the ground shirtless ... while one of his training partners heaved a weighted ball right at his stomach.

Bell took shot after shot after shot, obviously in pain each time -- but he kept coming back for more.

Eventually, after at least six body blows -- he tapped out ... but he made sure to show afterward how strong his abs were.

The training should come in handy for Bell next month -- as his upcoming opponent doesn't appear to be any sort of tomato can. If you're unfamiliar, JMX is 4-0 in his celeb fights -- and is coming off an impressive knockout win over TikToker Ginty.

Then again, Bell KO'ed Adrian Peterson last year and also gave MMA star Uriah Hall a run in the ring a few weeks later.

YouTuber Adin Ross has been the victim of repeated swatting pranks ... and now L.A. cops are taking steps to change how they respond to calls involving his house.

Law enforcement sources tell TMZ ... someone tried to swat Adin again earlier this month -- LAPD says they got a call about a shooting. It was all made up.

Cops say pranksters have phoned police numerous times when Adin was live streaming so cops would show up and interrupt his stream.

We're told LAPD will now take a different approach -- police will first contact Ross' security team to make sure it's not a prank before they send out patrol cars and helicopters.

Paddy Pimblett's beef with Jake Paul is still very much a thing ... and, uh, so much for not kickin' a guy when he's down!

The UFC star recently spoke to TMZ Sports, and let's just say he wasn't impressed with The Problem Child's performance during his 8-round, split decision loss to Tommy Fury last Sunday in Saudi Arabia.

"It seems to me like Tommy Fury was boxing bad against his last few opponents on purpose, know what I mean? Or Jake Paul's just a terrible boxer, even more worse than I thought. I was giving him more credit than I thought he deserved," Pimblett told us.

Of course, one judge scored the fight 75-74 (4 rounds apiece, but Jake had a 10-8 round in the 8th), while the other two had it 76-73 (6 rounds to 2 for Tommy).

"Tommy won anyway and I thought it wasn't a split decision, either. I thought it was a unanimous decision. He won most rounds."

Now, the 28-year-old speaking out against Paul isn't new -- remember, the two stars went back and forth last year after Pimblett suggested his fight against Anderson Silva was fixed.

Jake even offered Paddy $1 million if the UFC fighter could beat him in a 5-round sparring session. That hasn't happened, yet ... so we asked Pimblett if he's still down to do it.

"Yeah, if he wants to," Pimblett said. "I don't give a f***. I'll spar with anyone."

In the meantime, Pimblett's getting into the fitness business, releasing a workout supplement, Paddy “The Baddy” Everything Ultimate Pre-Workout with ABE that's only sold at The Vitamin Shoppe ... and he's stoked.

"It's my lil' boost of coffee in the morning to wake me up and make me get up and actually get out and see the day," Pimblett said.

Jeffree Star is following up on his controversial remarks about people using they/them pronouns -- telling us he has no beef with nonbinary people, but he is accusing them of going overboard with labels.

We got the makeup guru Thursday at LAX, where he stood by the comments that got a lot of folks heated. He's fully aware of the brewing controversy, but insists it had to be said ... and, even further, he says he's the perfect messenger.

For those unaware, Jeffree recently got candid about people who use the gender-neutral pronouns they/them ... calling it "stupid" and some "bulls***" made up when Americans got bored during the pandemic.

While some saw it as a brutal, hate-filled statement ... Jeffree thinks people missed his point altogether. He tells us he recognizes nonbinary people are out there, and respects anyone's labels, but doesn't think he should be put on blast for speaking his mind.

Maino is maintaining his now viral throat grab of YouTuber Buba100x was completely planned ... and, in fact, he says his theatrical performance should be his big break in Hollywood!!!

We caught the BK-bred lyricist fresh off his guest hosting gig on Angela Yee's 'Way Up,' and he tells us Buba100x intentionally failed to post the choke out ... in order to make folks think it was authentic. No one would flaunt themselves getting genuinely beat down ... right?

The incident happened a couple of weeks ago during the most recent Daniel's Leather fashion show ... Maino is seen slowly losing his temper as the vlogger continues pressing him to try on his chain, only to see the rapper grab him firmly by his throat!!!

Maino says jaws were dropping at the party because he and Buba100x sold it so well.

Social media users haven't reacted kindly to Maino's actions -- prank or not -- but he assures us he's not worried about backlash because that's what the internet does ... no matter what.

What Maino's not opposed to, is extending his stay on 'Way Up' to a more permanent situation.

He says Angela called him an on-air "natural," and having that kinda finesse is vital for a radio career.

Maino was caught in 4K disciplining popular YouTuber, Buba100x after one too many questions about his chain ... but the Brooklyn rapper is claiming it was all for clicks and views!!!

The melee went down at the Daniel's Leather fashion show earlier this month ... as Buba100x and Maino were conducting his typical TikTok style of interviews.

Buba100x made a crack about "beating Maino's ass" ... which immediately aged terribly when the Brooklyn rapper grabbed the jokester by his throat after his fuse was lit!!!

Further footage shows Maino pinning Buba100x down by his neck while reminding him of the consequences of ruffling his feathers!!!

Maino's co-hosting on Angela Yee's new show 'Way Up' this week ... and there's no way they were ignoring this topic, which was addressed head-on.

Maino claims he was 100% acting in the clip and wanted to sell the prank by making it look real with his angry emotions.

Josh Flagg doesn't think all of the stars on 'Selling Sunset' are legit real estate agents, and a few ex-cast members are weighing in ... along with Jason Oppenheim, who's at the center of this.

ICYMI ... the 'Million Dollar Listing' star posted a video reviewing the most cringe moments from season 5 of 'Sunset' -- and based on his snarky commentary, it's clear Josh doesn't think too highly of the hit Netflix reality show.

If his words weren't clear enough, his caption was ... "If you’d like to watch a real estate show with licensed agents, make sure to watch last nights episode of MDLLA on @peacock. If you want to watch actors pretend to be agents, tune into my newest YT video (Link in bio) where I review Selling Sunset. @estatemediala."

None of the agents currently on 'Sunset' have said anything just yet, but 2 former ones -- Christine Quinn and Maya Vander -- did, and they seem to agree.

Vander says she definitely had her license when she was on the show, while Quinn doesn't say one way or the other. However, she's squarely on Josh's side about the real focus of 'Sunset.' She responded, "The joke is on y'all if you think Selling Sunset was ever about Realestate."

CQ later clarified who on the show has licenses, from what she knows -- she name-dropped Maya, Davina Potratz and Chelsea Lazkani, and added she wasn't sure about the extras.

Now, we got Oppenheim himself to chime in on this too ... and he downplayed the apparent animosity between Josh's show and his own, telling us they're really good friends and that this was nothing but some light ribbing that's not meant to be taken seriously.

He also definitively said that all of his agents have their licenses and that everyone knows that. To be frank, we're not so sure Josh agrees. If he does, he's doing a great acting job in his attack on Jason's show.

Like we said, none of the current cast members have directly responded to Josh's insinuation some of them aren't licensed agents.

Trick Daddy recently interrupted his own cooking to show to completely UNLOAD on Uncle Murda .. all because he's fed up with the G-Unit rapper's infamous yearly "Rap Up" anthems.

The Miami hip hop legend was warning viewers of the pitfalls of going viral when he turned his ire towards Murda ... dubbing him "The #1 Clown" in the rap game -- 5 years and running!!!

Trick scolded Murda for stalking countless rappers throughout the years, and preying on their most vulnerable moments.

Of course, Trick was one of the many rappers caught in Murda's crosshairs -- but he's held his tongue about it for a couple of years.

Murda dissed Trick back on the 2021 "Rap Up" over his "Beyonce can't sing" comments and subsequent "coke head" remarks ... but Trick says he's calling Murda out for the guys who can't speak up for themselves in the brutal social media gauntlet.