Hot Vegas

Floyd Mayweather Jr.'s baby mama is LIVID -- telling TMZ, her 10-year-old daughter was dressed up like some gold-digging hoochie at the big fight on Saturday ... and it's all one designer's fault.

The designer in question is Project Runway's Michael Costello -- and Floyd's baby mama Josie Harris tells us, Costello was hired to design a very special dress for the boxer's 10-year-old daughter Jirah to wear at the Canelo fight in Vegas (left).

Josie says the dress came out great -- but when they showed up to the fight, she noticed Floyd's on-and-off-again side piece Shantel Jackson wearing the same exact dress (right).

According to Josie, she paid Costello $795 for a one-of-a-kind dress, and now she's pissed the guy gave a replica to none other than Floyd's girlfriend ... who also sat ringside.

Josie tells us, "It's an unspoken rule and a cardinal sin for a 'real designer' to dress clients alike going to the same major event ... Tacky, tacky, tacky."

And Josie didn't stop there, turning her anger toward Jackson as well ... adding, "She is a total gold digger ... She conveniently came back around 2 days before Floyd got his $41.5 million check."

As for the designer, Costello says he will NOT be giving anyone a refund -- telling us, "No exclusivity was promised regarding the dress. If you want exclusivity, you need to pay more." Costello says his people told Miss Jackson that Floyd's daughter would be wearing the same dress and she didn't care.

"Breaking Bad" star RJ Mitte isn't the least bit embarrassed that he celebrated his 21st bday in Vegas with his mom ... telling TMZ, "WE PARTIED HARD!!!!"

We broke the story ... Mitte -- who plays Walter White Jr. on the AMC show -- raged in Vegas with a bunch of hot chicks for his bday last month ... with his mom by his side.

But outside Cecconi's in West Hollywood this weekend, Mitte told us his mother's not just a huge party animal -- she also makes a SOLID wingman.

No one looks out for you like mom.

Britney Spears will spill the beans about her upcoming Vegas spectacular tomorrow, TMZ has learned -- and the announcement itself will be an extravaganza in the middle of nowhere.

We're told Britney will unveil plans for her big new Planet Hollywood show from an undisclosed location in the Mojave desert at around 4AM PT, and it will be broadcast live on "GMA."

It's going to be huge -- 1,350 participants will be bused from Vegas to the desert. And get this ... all attendees must be between 5' and 6' tall ... we don't know why.

As for Brit ... she'll be arriving via helicopter.

All told, we've learned the show announcing the show will cost roughly $100,000 -- including $27,176 to bus all the people (28 buses total), $4,200 for tents, and $5,154 for craft services ... which includes 2,100 bottles of water, coffee, 918 Gatorades, and 567 Red Bulls.

We're told Britney will be performing her new single "Work Bitch," and she'll then blast specifics about her new show that debuts in December. In case you can't wait, we have a bunch of particulars, including what she'll be raking in.

4 AM, huh. Bets on lip-synching anyone?

Call him Dennis Rodman, 'cause Liam Hemsworth was rebounding like a CHAMP in Vegas last night ... spittin' some serious game to a smokin' hot chick -- and from the looks of things, it worked.

Just one day before reps "officially" announced the demise of his engagement to Miley Cyrus, Liam and 5 of his friends hit up XS Nightclub ... where he ran into 23-year-old Eiza González.

FYI -- Eiza happens to be a singer/actress (seems like someone's got a type).

They drank ... he smoked ... they flirted ... they were thisclose ... and people in the club said they never left each other's side before leaving the joint together at 2 am.

Muy bien.

Britney Spears will be raking in HUGE STACKS in Vegas this winter -- a ridiculous $310,000 per show ... nearly $15 million per year -- but she still doesn't hold a candle to Celine Dion.

TMZ is privy to the financial details of Britney's deal. The 2-year contract calls for 48 shows a year at Planet Hollywood. According to the contract, Britney will earn $310,000 per show.

By contrast, Celine does 70 shows a year. Sources say she pulls in $476,000 a show ... so she's way ahead of Britney in the money department, but Brit gets more time off.

Britney's cut of the gate is huge -- projected sales per show are $508,514, meaning Brit will be snagging more than 60%.

As we reported, producers are shooting for a "cool, hip club-like show" ... unlike the run-of-the-mill Vegas shows that preceded it (Celine's included). It starts in December.

If that's not convincing, check out these cool 3D mock-ups of the stage.

Guitar legend Carlos Santana slammed into a parked car in a fancy Las Vegas neighborhood Friday night ... but cops say he wasn't driving drunk.

The 66-year-old was in Vegas for a couple of shows -- but he didn't have a performance on Friday night.

A spokesman for the Las Vegas Metro Police Department says no one was injured in the wreck -- noting there was no one inside the parked car at the time of the collision.

As for the make and model of Santana's ride -- so far, that's unclear ... but we're workin' on it.

A police rep told the Las Vegas Review Journal ... "He hit a parked car, it was a minor accident, is all" ... adding the incident wasn't even "log worthy."

Justin Bieber just high tailed it to Las Vegas with his crew to walk Floyd Mayweather into the ring tonight ... and they're clearly expecting "Money" to kick ass.

Justin boarded with Lil Twist, Lil Za and a few others Saturday for Floyd's fight against Saul "Canello" Alvarez -- and most of his entourage were proudly sporting Mayweather's Money Team shirts.

Worth noting ... no visible puffs of smoke as they boarded the plane ... this time.

8:20 PM PT -- Bieber is officially backstage with the champ.

Justin Bieber has successfully weaseled his way into Floyd Mayweather's inner circle -- AGAIN -- TMZ has learned, the 19-year-old will walk Money May to the ring tomorrow before his next big boxing match in Vegas.

Bieber has been ingratiating himself with Mayweather since last year, when the singer appeared out of nowhere at Mayweather's match against Miguel Cotto ... walking the fighter to the ring, and celebrating with him afterwards (along with Lil Wayne).

The courtship continued ... and this summer, Mayweather flew Bieber out to his 13-year-old daughter's birthday party.

Now, Bieber's back for more shameless money-flaunting publicity whoring ... agreeing to accompany Mayweather to the ring Saturday at the MGM Grand, where May's set to fight Saúl "Canelo" Alvarez.

And he deserves to get his ass kicked. (We may or may not be talking about Alvarez.)

Wanna live like Wayne Newton?

First, get about 45 face lifts (allegedly) … then, PLACE AN OFFER ON HIS FAMOUS LAS VEGAS ESTATE … but only if you’ve got around $70 million laying around.

The 36-acre ranch – which Newton famously dubbed Casa de Shenandoah – has hit the market … just months after Wayne and his wife moved out following years of legal battles over money (or lack thereof).

CdS has it all -- plush white carpets, gold trimmed doors, a "car museum," 37 empty stables, lots of rundown buildings, an old ass tennis court, a dilapidated gazebo and a jumbo jet and terminal.

Of course, the property was the scene of Wayne’s infamous date with Ellen Griswold in “Vegas Vacation” … remember, she was a Wayne-iac?!

Anyway, the developer who bought the property in 2010 originally planned to turn the ranch into a Wayne Newton museum. Those plans have been scrapped. Now, he just wants to unload quick … for quick $70 mil.

Fun Fact -- the owner did dump millions into upgrading the property ... including an “upgrade” of removing 7,000 cubic yards of horse manure from the grounds.

What did Spencer Pratt do for his 30th birthday? He watched his plastic girlfriend Heidi Montag jump out of a plastic cake at a strip club in Vegas. Woooo adulthood.

Spencer, looking a little fuller these days, celebrated the day of his birth inside the VIP section of famous strip club gentleman's club Crazy Horse III on Saturday along with Heidi and friends.

In the pics Heidi goes all Marilyn Monroe on a giant fake cake. Spencer looks pretty happy about it.

"Breaking Bad" star RJ Mitte turned 21 in true Vegas style -- partying with booze, scantily clad women ... and his mom (not at all scantily). So, why party with Mom?

Here's the best explanation from our newsroom -- and by best, we mean ... worst.

“Breaking Bad” star RJ Mitte rang in his 21st birthday by RAGING in Vegas -- with tons of hot chicks, tons of hard booze ... and his mother???

Mitte -- who plays Walter White Jr. on the AMC show -- hit up Ghostbar at the Palms Casino Resort this weekend ... where he partied hard with his BB co-star Daniel Moncada, “True Blood” actress Lindsey Haun and Amanda Fuller from “Last Man Standing."

... and his mom was there, too!

But parental supervision didn't keep Mitte from enjoying all that Vegas had to offer -- we're told the actor downed some Jack Daniel’s Tennessee Honey cocktails while cake fighting with some babes.

Hopefully RJ's night of boozing ended better than that time WW2 got drunk ...

Kevin Federline didn't just get married this weekend ... he got DOWN ... freak dancing with his brand new wife Victoria Prince at their Vegas wedding, and we got the pics.

As we reported, 35-year-old Federline and girlfriend Victoria Prince got hitched Saturday night at the Hard Rock in Vegas, and they really pulled out all the stops. Kevin was acting like Kevin (a total goofball) and Victoria couldn't stop flashing her new bling. Side note: Victoria looked hot.

FYI, Kev and Vic have been dating since 2008 and already have one daughter, Jordan Kay, who was present for the ceremony.

The wedding looked beautiful, but it still didn't hold a candle to Kevin and Brit's 2004 wedding, which reportedly cost $1.8 MILLION. Not that it's about the money, or anything.

Kevin Federline is on the cusp of beating Britney Spears' record ... in approximately 43 hours his Las Vegas marriage will have lasted longer than hers.

K-Fed tied the knot Saturday with longtime girlfriend Victoria Prince. Their baby daughter -- Jordan Kay -- watched it all go down at the Hard Rock hotel around 8 pm ... as papa Federline made an honest woman of her mom.

The two have been dating since 2008, so it seems K-Fed has it together.

Britney Spears will announce in several weeks her Vegas deal we told you about 2 months ago ... and as it was put to us, "It's not your father's Shania Twain concert."

Sources connected with the deal tell us ... Britney will bring a "cool, hip club-like show" to Planet Hollywood. We're told it will NOT feel like a run-of-the-mill concert -- the vibe is very different. And the show will change on a fairly regular basis.

We're told the deal also includes appearances Britney will make at various pool parties, as well as the Planet Hollywood nightclub.

BTW ... there are reports Britney talked to the judge in her conservatorship case about her upcoming Vegas shows. Not true. Our sources -- and they are extremely reliable -- say not a word was mentioned. The judge has long been down with the show.

Screw Disneyland ... after Chris Weidman delivered his KO punch to Anderson Silva, the new UFC champ took his fists straight to a Vegas club to reap the spoils of his victory.

The celebration went down at Surrender Nightclub inside the Wynn hotel. We're told Chris rolled in at 1:30 AM with a crew of about 40 people ... including NBA champs Mike Miller and Udonis Haslem.

He also brought his giant championship belt.