Jamie Foxx -- 40 Going on 21

12/22/2007 10:03 PM PST
Jamie Foxx doesn't have a lame, quiet dinner with friends to celebrate his birthday -- he parties like a rock star in Vegas! Foxx's actual birthday was December 13, but last night he had his fourth birthday party to celebrate turning the big 4-0. Who needs sleep anyway?

The now handsomely older Foxx celebrated at Jet nightclub at the Mirage -- and kept a hot, young blonde by his side all night!

We're not sayin' she's a gold digger ...