Hot Vegas

The girl-on-girl action went down at The Palms Hotel on Sunday ... where the next day, Sheen was spotted taking a shot of Grey Goose at a hotel bar.

We're told the vodka session was the tail end of an epic "bender" -- and Bree, along with two mystery porn stars, was with Charlie for some of the action.

But, as TMZ previously reported, Sheen's people are very concerned about the actor's health -- and members of his inner circle have been urging him to check into a rehab program. We're told Charlie doesn't think he has a problem.

Sheen -- who was with a female companion -- bought himself the Grey Goose vodka shot ... and we're told there were other shots before that.

Charlie -- who has been in Vegas since the weekend -- was complaining to people at the bar that the suits behind "Two and a Half Men" had been urging him to go to rehab.

That's not far off. We're told Warner Bros. has been in touch with Charlie's team, trying to figure out a way of getting Charlie healthy. Sources say members of Charlie's team have urged him to go to rehab, but Charlie doesn't think he has a problem. Apparently, he's the only one who doesn't.

Sheen is due back on the set of the show tomorrow morning.

The "High School Musical" star will party at Pure Nightclub in Las Vegas this Saturday.

Don't fret, Vanessa ... 22 really does suck, whether you're with someone or not.

Ronnie endured a six-hour session at Mario Barth's King Ink in Las Vegas earlier this week to complete his heaven and hell themed tattoo. Ronnie's on and off girlfriend, Sammi Sweatheart, was there as well.

Sources close to the reality star tell TMZ, as soon as Ronnie sits down at his VIP table at Jet nightclub in Vegas on Saturday ... he'll get 2 magnum bottles of GG ($950 each) and 5 magnum bottles of Dom Rose ($1,875 each).

That's a grand total of $11,275 -- but good news for Ronnie, it ain't gonna cost him a dollar ... we're told the nightclub is comping everything.

Ronnie will be joined by his on-again, off-again GF Sammi Sweetheart and his manager Matt Cohen, plus six of his best buds from NYC.

Johnson took his black eye out for a round at Vanity nightclub at the Hard Rock Hotel on Saturday night with fellow UFC badass Quinton "Rampage" Jackson.

UFC Prez Dana White is hosting a benefit at Vanity Nightclub in Vegas this Friday to raise money for TJ Lavin and Ty Pinney -- who each wound up in a coma in separate accidents last month.

Barker, Dyrdek and Shane Victorino are just some of the stars helping out -- we're told a bunch of celebs are also pitching in.

Whaaaaaaaaaaaaaaaaaaaat?!

The former NFL great turned Geico pitchman hit Vanity nightclub at the Hard Rock Hotel in Vegas over the weekend ... where dude took in all the sights.