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Jennifer Aniston sure looks excited (or is that startled?) to see someone!

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And she should be - it's boyfriend John Mayer! So much for rumors of a split. X17 spotted the two having dinner together (and with friends) at the Sunset Tower Hotel late last night... at midnight, in fact!

That's because both parties were at the 2009 Grammy Nominations Concert at the Nokia Theatre and met up at the restaurant afterwards.

Jen looks so giddy, right? It's a welcome change from her usual dour expression!