Oscar Parties 2011: 50 Cent, Jennifer Hudson, Justin Timberlake, Jamie Foxx, Prince, Skylar Grey, Justin Bieber

Jamie Foxx mingled with Justin Timberlake and girlfriend Jessica Biel at the 2011 Vanity Fair Oscar Party following Sunday’s Academy Awards. Inside the exclusive affair, VIPs including 50 Cent, Madonna, Jake Gyllenhaal, and Cameron Diaz dined on In-N-Out Burger in their designer duds at the Sunset Tower Hotel in West Hollywood.

Justin Bieber stepped out with girlfriend Selena Gomez and was introduced to rock legend Mick Jagger, while other star sightings included Jennifer Hudson and Def Jam co-founders Russell Simmons and Rick Rubin.

Over at Elton John’s 19th Annual AIDS Foundation benefit at the Pacific Design Center, Jamie Foxx, Skylar Grey, and Cee Lo Green watched as Florence + the Machine and Elton dueted on “Tiny Dancer.” A camera-shy Prince made a quick entrance, and Kim Kardashian and Sharon Stone held court inside.