Demi Lovato’s been living in the fast lane lately. She released an album in July and successfully collaborated with the Jonas Brothers on a hilarious music video. She also worked with the three bros again on the sequel to the Disney hit movie, "Camp Rock 2"! She’s a surefire hit and a surefire hit deserves a great party, right? Of course! Demi was spotted at her huge graduation/birthday/coming out bash over the weekend at the Roosevelt Hotel in Hollywood.

I know what you’re thinking. Quite the party, huh? That's not the weird part though. Her birthday was August 20th and nearly three months later she's celebrating still. I wish I could have three months of birthday celebration!

To get a closer look at Demi's big night, click the picture above. After the jump, check out Britney Spears with a new beau. Britney Spears and her new bf Jason Trawick were Spotted! with Brit’s children at the Sydney Botanical Gardens on November 14th. Jason works as a talent agent for the singer, Paris Hilton and Hilary Duff among others.

Britney's Single’s Collection album will be released tomorrow to much publicity — MTV News will looking back on the pop star's career through interviews with video directors, music-industry insiders and Britney herself, as she reflects on some of her greatest hits.

Earlier today, Nigel Dick,the director of her iconic " ... Baby One More Time" recalled that her school girl outfit came from Kmart.  Check out who else MTV Spotted!, including Jessica Biel at the "Planet 51" premiere, Blake Lively at her "Pippa Lee" red carpet, Justin Bieber performing at "Good Morning America" and more!