Hot Vegas

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.

Some people said it couldnt be done ... but last night reigning UFC champ Anderson Silva LOST his first title fight in seven years ... when Chris Weidman knocked his ass out.

It all went down in Las Vegas as the MGM Grand Garden Arena. Chris and Silva faced off ... with Silva -- considered the best MMA fighter in the history of the sport -- defending his seven-year stronghold on the middleweight title.

But Silva was fighting cocky -- with his hands down -- and by the 2nd round it caught up to him ... when Weidman caught the Brazilian with a nasty left hook. Silva instantly went down and Weidman was crowned the new champ.

Las Vegas cops have cleared former baseball slugger Jose Canseco of allegedly sexually assaulting a woman last month.

Vegas detectives have closed the case and will not seek criminal charges.

Canseco was adamant from the get go ... the woman's claims were BS and the two had consensual sex. He took his own polygraph to prove his innocence, and passed with flying colors.

Just hours before Jose Canseco allegedly committed rape ... the alleged victim posed for a very flirty pic with J.C. in a Vegas casino and joked that they had just gotten married, TMZ has learned.

The pic was taken on the floor of the MGM Casino at 2:51 AM on May 10 -- with the woman cozying up for a couply shot with Jose ... with her open right hand placed on the center of his exposed chest.

The person who took the photo says he's a huge Canseco fan (apparently those still exist) ... and had recognized Jose strolling around the casino with a female companion.

The fan asked Jose if he could snap a shot -- and Jose obliged, striking a pose with the woman while she giggled and told the photog she and Jose had just tied the knot.

For the record -- we've done some digging, but couldn't find any proof of a Canseco marriage.

The photog told us the two seemed happy ... no signs of distress.

Of course, things changed -- 'cause the woman reportedly told police Jose drugged and raped her later that day.

Jose has denied the allegations -- claiming his accuser is making up the story for publicity.

Jose Canseco's ex-GF tells TMZ ... she believes J.C. is COMPLETELY INNOCENT ... and claims the woman accusing the former MLB star of rape is nothing more than a lying publicity whore.

We spoke to Leila Knight -- who dated Canseco for more than 4 years -- and she tells us she's spoken with Canseco at length about the sexual assault accusations that have been made against him in Las Vegas.

"I've been talking to him all day ... it's obvious that it's a publicity stunt, I mean -- the girl's an aspiring actress," Knight says.

Knight also says Canseco is a "gentle person" who always tells the truth -- "If anything, he's too honest."

Jose Canseco is under investigation in Las Vegas after a woman filed a report accusing the former MLB star of sexual assault ... but Jose says it's all BS, TMZ has learned.

Law enforcement tells us ... the 48-year-old retired baseball player has been named as a suspect in a police report filed with the Las Vegas Metro Police Department.

We're told ... the person who filed the report says the incident went down on May 10.

Canseco went to his Twitter page moments ago and said, "[The accuser] told police that I druged [sic] her and then raped her. hmmmmm. lets find out what really happened."

The accuser appears to be a fitness instructor who lives in Vegas.

This could get bloody ... a design company has sued Eli Roth's Goretorium, saying the Las Vegas haunted house and its business partners have been dragging their feet on a $50K bill ... TMZ has learned.

The "Hostel" director opened the horror attraction in September and hired The Uprising Creative to create all kinds of promotional materials -- logo design, branding, videos, the like ... this according to the lawsuit filed today in Los Angeles.

Uprising says it was paid more than $134,000 over several months ... but the checks stopped coming with $50,853.93 still unpaid. They're alleging breach of contract and fraud ... and want the $50K plus interest and legal fees.

The Goretorium corporation is being sued ... not Roth. So far, no one's returned our calls to the office in LV.

Interesting side note ... in the suit, Uprising says one business partner recently told them to be patient -- because March was the Goretorium's first break-even month since October ... and that if Uprising sued, he would just file for bankruptcy.

Now we'll see if he was bluffing.

Attention West Beverly High alumni: Steve Sanders is jacked.

Former "Beverly Hills, 90210" star Ian Ziering is getting pumped for his upcoming gig stripping with the yoked man panty crew of Chippendales ... by working out -- with a photographer on hand -- in Studio City on Thursday.

While the 49-year-old's shirtless Vegas stint doesn't start until June ... he's already showing off his peach pits.