Rihanna Leaving The Roxbury

What do rock stars do when the Billboard Music Awards are over? They party like rock stars, naturally. Watch: Relive the Billboard Music Awards' Best Moments After performing at the May 19 show, Bruno Mars hit Las Vegas hotspot The Bank Nightclub at The Bellagio. "He was in a really good mood and was dancing around and having fun with his friends at his table," a partygoer tells OKMagazine.com. "He was really friendly." Bruno was also very entertaining. The singer wow'd the crowd when he jumped on the mic and performed his hit song "Locked Out of Heaven." Photo: Pauly D Parties in Vegas with Vinny's Mom! Chris Brown also hit the popular club with his on-again girlfriend Karrueche Tran. In case you're wondering, Chris seems to be doing just fine without Rihanna around. OK! News: Four Weird Justin Bieber Moments at the Billboard Music Awards "He was also in a great mood and looked really happy with Karrueche," says the eyewitness. Which stars would you have liked to party with after the Billboard Music Awards? Tell us in the comments section or on Twitter @OKMagazine     Photo credit:  Denise Truscello/WireImage/The Light Group

On the heels of Pharrell Williams joining the fashion competition show last week, Style Network’s “Styled to Rock” has added model Erin Wasson to its panel of mentors for the Rihanna-produced series. Show, slated to bow on the NBCU cabler later this year, follows 12 up-and-coming designers as they compete to style A-list celebs. Wasson,... Read more »