John Mayer, Katy Perry, and More Stars’ Most Shocking Vegas Confessions

John Mayer had sex with a girl named "Dimple$."

"I met a girl one time in Vegas," he said. "Her name was Dimples, and the 's' in Dimples was a dollar sign. I have this weird feeling, a pride thing, for the people I’ve had relationships with. I still feel like I’m with them, in the sense that if I f—ed Dimples, what does that say about someone like Jennifer [Aniston]? I feel like it’s all connected. How could I ever cosmically relate these two people?"

Full House's Jodie Sweetin partied and did drugs.

"I was always up for any party, especially if it involved Las Vegas," she revealed in her memoir, Unsweetined. "One weekend, everyone decided to head out to Vegas, but before I could leave, I had to get cash from the bank since I had misplaced my ATM card. I took out $10,000 in cash to bring with me to bankroll the alcohol and drugs for everyone."

Charlie Sheen used his dad's credit card to pay for a Vegas prostitute when he was 15 years old.

“I remember having the greatest night of my life,” he said. “Two weeks later my father wanted to know about this bill on his statement.”

Bruno Mars got arrested for cocaine possession.

"I was young, man! I was in f–king Vegas," he said. "I wasn't thinking."

James Van Der Beek let an underaged Justin Timberlake use his I.D. to get into a club.

“I was in Vegas one New Year’s and somebody came by and said, ‘*NSYNC wants to meet you!’ So I said, ‘OK.’ And I met them and they were so sweet," he said.

“I remember that night, we were all going to some club and they were all too young. And so I went in and then somehow passed my I.D. back so that Justin [Timberlake] could get in with my I.D.

“…Justin used it to get in and then tried to pass it off to Lance [Bass] to get in. By the third time [the bouncers] saw a James Van Der Beek I.D., they were like, ‘Ah, I don’t think so James.’”

Mario Lopez had a one night stand in Vegas with a "mega famous pop star."

In his memoir, Just Between Us, he describes a drunken encounter with “a certain mega pop star who shall remain nameless."

He later explained on The Ellen DeGeneres Show, "Out of respect for this person… you know, I’m a gentleman and I don’t like to drop names, so I’m not going to go there."

Former NFL star Adam Jones blew $1 million during one crazy weekend in Vegas.

"I was 20 years old when I got 18.9 million dollars," he said. "I bought a Ferrari and a Bentley that weekend. Not a good decision.”

Katy Perry had a fake Vegas wedding to scare her conservative parents.

“We wanted to freak out our parents, you know it was my first boyfriend,” she said. “So we decided we would go to have a fun trip to Vegas, and while we were there we went to the charity shop. We picked up some, you know, charity dress and a little tux and we went and took wedding photos and got fake married. We got the fake certificate and everything."

YouTube star Tana Mongeau let a Disney celeb borrow money to buy cocaine at a Vegas party.

“This Disney star is not just any Disney star; he at one point was a f–king superstar,” she said. “After about 20 minutes of conversation, he’s like, ‘Yo I left my wallet in the car, do you think I could borrow $40 from you? I’ll pay you back by the end of the night.

“About 20 minutes later, a guy walks over to him… and the guy pulls out a little thing of cocaine and [the Disney star] hands him $40 — my $40!"

Olympic track star Suzy Favor Hamilton used to work as a high-end Vegas escort.

"My first client was a 47-year-old cowboy named Paul who was incredibly wealthy," she wrote in her memoir. "I was thrilled when a tall, handsome gentleman opened the doors to the biggest suite I'd ever seen.

"The next thing I knew, an hour had passed. He handed me an envelope. I counted ten $100 bills. My rate was $500 an hour. He'd paid me double!"

Aubrey Plaza almost got married to Michael Cera.

"I dated [Michael] for a long time," she said. "We drove across the country after we shot [a] movie and almost got married in Vegas."

Ben Affleck was banned from a casino.

"That is true," he said. "I took some time to learn [blackjack] and became a decent blackjack player. And once I became decent, the casinos asked me not to play blackjack. I mean the fact that being good at the game is against the rules at a casino should tell you something about a casino."

NEXT: Kendra Wilkinson, Aubrey O'Day, and More Stars' Most Shocking Sex Confessions About Other Celebs