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9:20 AM PT -- Dave Coulier responded to the John Stamos haters this morning on his Instagram.

"I'm sorry to see a bunch of negative comments as I've just begun my cancer journey.

"It's our friendship (me and John) and this is how we are handling a very tough time. I'm a comedian and humor is what drives me. John knows how to cheer me up and I laughed out loud when he arrived wearing a bald cap - being a true and loving friend and brother."

John Stamos is showing solidarity with his friend and former TV castmate Dave Coulier during his battle with an aggressive cancer, but some people online are taking issue with his method ... calling him insufficiently committed to the cause.

Stamos posted a few pics on Instagram of fellow "Full House" actor Coulier, featuring Stamos wearing a bald cap and shaving Coulier's head, who's going through chemotherapy treatment after his recent cancer diagnosis.

Coulier is battling stage 3 non-Hodgkin lymphoma, an aggressive form of cancer. The pic shows Stamos shaving Coulier's head, and the friends are both smiling ... as Stamos acknowledges he used a little Photoshop magic to make the bald wig blend. A third shot shows Dave's wife, Melissa, and John both kissing Dave's freshly shaved dome.

Sabrina Carpenter's celeb squad kept the star power rolling in L.A. -- night 3 of her "Short n' Sweet" tour stop at the Kia Forum in Inglewood, California brought out none other than Selena Gomez and her BF Benny Blanco.

Peep these pics of Selena rolling up Sunday -- rocking a head-to-toe pink rabbit onesie with floppy ears for max cozy vibes, while Benny sported a pastel pink tie-dye hoodie to match the laid-back energy.

Selena and Benny ditched the PDA for the night, with the actress arriving alongside her little sis Gracie and some pals, calling it one of her favorite nights in an IG Stories shout-out.

Former U.S. Representative of Florida Matt Gaetz, Donald Trump's nominee for U.S. Attorney General, is continuing to combat sexual misconduct allegations ... including claims he flew 2 women to NYC to have a real-life "Pretty Woman" experience.

Florida attorney Joel Leppard, who represents the women involved, sat down with ABC News' Juju Chang ... and he revealed his clients spoke with Congressional Ethics Committee investigators about their interactions with Gaetz -- which they say included repeated paid sexual encounters.

As we told you yesterday, Leppard detailed in the interview one of his clients testified in July 2017 seeing Gaetz having sex with her friend -- when the latter was only 17 and the former Congressman was 35. Leppard also said the 2 women testified they were paid for sex by Gaetz via Venmo.

Cher is opening up about the darker moments from her marriage to Sonny Bono ... revealing in her new memoir the music legend "seriously thought" about killing her toward the end of their union.

The new book, titled "Cher: The Memoir (Part One)," details the turbulent aspects of her and Sonny's union ... she confesses she was so unhappy at one point, she considered taking her own life by jumping from the balcony of a Las Vegas hotel room.

Per Cher, while she and Sonny stayed at the Sahara Hotel in October 1972, she revealed to SB her unhappiness ... and told him she desired to sleep with their guitarist, Bill.

Charli XCX is taking the Big Apple by storm ... putting on a surprise performance Monday after her appearance on "Saturday Night Live" over the weekend.

The pop star popped up onstage in Times Square last evening just 30 minutes after the H&M clothing company announced that Charli would be putting on a gig. Charli did the show to promote her new holiday fashion line for H&M.

She cranked out several of her hits in front of a packed crowd, including “360,” “365,” and “Apple.”

An NHL referee was stretchered off the ice and taken to the hospital on Monday night ... but, thankfully, it appears he's going to be OK.

The scary scene all unfolded in the middle of the Avalanche vs. Flyers game in Philadelphia ... after Colorado defenseman Josh Manson accidentally crashed into Mitch Dunning near the blue line.

Manson hit Dunning in the back with such force that it caused the official to lose his balance and tumble to the ice. For several moments, Dunning then lay motionless as trainers raced to his aid.

Boxing fans want to see Jake Paul take on a "real" challenge after beating Mike Tyson ... and well, they might get their wish -- 'cause heavyweight champion Daniel Dubois just called him out for a fight.

The 27-year-old IBF title holder extended the offer to El Gallo ... saying, "Hi Jake, good business on the weekend but how would you feel fighting for the legitimate heavyweight championship of the world this is Daniel Dubois calling you out."

"Let's get it on."

Late Boston Red Sox knuckleballer Tim Wakefield's Florida estate is up for sale ... TMZ has learned.

Tim's waterfront mansion hit the market Friday ... and it's listed for $3.3 million.

Tim lived in the 4-bedroom home in Indian Harbour Beach, FL when he died from brain cancer.

Sorry, fight fans, don't expect Francis Ngannou to share the ring with Jake Paul ... 'cause The Predator tells TMZ Sports that scrap will never happen!

We caught up with the former UFC heavyweight champion following the wildly successful Netflix boxing event that saw 60 million households tune in for Paul's unanimous decision win over Mike Tyson -- and we asked him about his tweet, saying he'd slap El Gallo the next time he saw Jake.

With fans pumped at the prospect of a Paul and Ngannou fight, we had to see if there was a chance. Unfortunately, the 38-year-old wasn't having it, saying the prospect of them sharing the ring is straight up disrespectful.

President-elect Donald Trump tapped Robert F. Kennedy Jr. to Make American Healthy Again ... so you can imagine our suprise when RFK was photographed with a plate of fast food on a private jet with Trump and Elon Musk.

RFK Jr. has been railing against bad things in our food for years, so it's fair to wonder if he actually took a bite of the McDonald's burger, nuggets and fries he was given for a photo op on a plane ride to Mar-a-Lago ... and we examine it all on today's edition of TMZ TV Hot Takes.

Check out the clip from "TMZ Live" ... Harvey and Charles kick start the debate ... did RFK Jr. really eat the Golden Arches. Some of us in the office are having a hard time believing it, and the picture kinda says it all.

Before this cutie pie talkin' on the telly turned into a pop star, she was just enjoying the beautiful outdoors of Canada ... and acting in school plays like "Annie" and "Grease".

Her high school drama teacher convinced her to audition for "Canadian Idol" -- where she wound up taking 3rd place -- and it was off the the music charts from there! Her hit song was basically the mantra for 2012 ...

She's collaborated with music stars like Owl City, Charli XCX and Justin Bieber.

"Hey I just met you, but this is crazy ...."

John Stamos is mourning the loss of a dear friend ... announcing the heartbreaking news on social media Monday.

The "Full House" alum posted a poignant tribute to his pal, Mike Owen, who he said he's been friends with since he was just 11 years old.

Stamos said he learned of Mike's passing in a text from his friend's brother ... sharing he was on a flight to Detroit when he received the news.

Phaedra Parks is weighing in on whether the 'Real Housewives' franchise should expand to welcome a MAGA-inspired cast ... observing it'd likely make for interesting, albeit "dangerous," TV.

Photogs caught up with "The Real Housewives of Atlanta" star, who teased her long-awaited return to the series ... making it clear she'll be back for more than one season.

However, it was her thoughts on the franchise's possible expansion that was most noteworthy ... issuing a warning to TV producers to tread carefully before casting big MAGA supporters for a new iteration.

Sundance Head -- the country singer who won "The Voice" back in 2016 -- says he didn't think he was going to survive after accidentally shooting himself.

The singer-songwriter is speaking out for the first time since Friday's gun incident in Texas and he says ... "I was sure that I was going to die."

Sundance Head says he was bleeding out on the side of the road after accidentally shooting in the stomach ... and he feared he was not going to make it ... until a stranger stopped and helped.

Kelsea Ballerini and Chase Stokes are going strong and very much lovestruck, as they were spotted cuddling up during a recent outing.

TMZ has obtained video of Kelsea and Chase getting extra cozy at Morgan Wallen’s This Bar in Nashville Saturday night -- looking like they were in their own little love bubble.

Kelsea and Chase were living it up in the VIP area, before stepping up to the balcony to dance it off, where Beyoncé's "Crazy In Love" fittingly played at one point.

Matt Gaetz, President-elect Donald Trump's pick for Attorney General, paid 2 adult women for sex and had sex with a 17-year-old girl in a pool ... according to the lawyer representing the women Gaetz allegedly paid for sex.

Florida attorney Joel Leppard told ABC News his clients testified before the House of Representatives ethics committee investigating Gaetz ... claiming the former Congressman used Venmo to pay them for sex.

Leppard also says one of his clients told lawmakers she witnessed Gaetz having sex with her 17-year-old friend at a July 2017 house party she attended.