Jen at Vince's Party -- Kisses Other Guy

3/29/2007 12:57 PM PDT
Perky "Dirt" guest star Jennifer Aniston was photographed laying the lips on a tall, handsome dude outside Vince Vaughn's birthday party -- er, not Vince.

Jen was saying goodnight to friend Courteney Cox, who was there with "Dirt" co-star Ian Hart (who apparently dresses exactly like his character even when on the town). Aniston hugged all of them, but the unknown dude got a kiss.

Alas, dear lovelorn Jen then went home ... alone.