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Chris Brown?! Talk about an odd mix...

Last night a handful of celebs attended Justin Bieber's birthday dinner at Maggiano's Little Italy at the Grove in Los Angeles, and Justin still isn't legal, but it doesn't look like that matters to his slightly older girlfriend Selena Gomez! Around 2am Justin tweeted, "great bday. flew in grandma and got my cake. hung out with friends. got surprised. and you all helped #makeachange with @charitywater." I suppose he's not a kid anymore, but what was he doing up until 2!?