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Sienna Miller, Channing Tatum, Ray Park and Adewale Akinnuoye-Agbaje were at MyHouse last night for the G.I. Joe: The Rise of Cobra afterparty, and the fans went insane for the action flick's stars!

Of course, Sienna Miller's usually frosty personality was a bit warmer, as she actually signed a few autographs for fans, and as always, Channing was super sweet to everyone. Hey, Sienna knows you gotta play nice when it comes time to promoting your latest projects! Think she's worried about what this movie will do to her rep if it flops at the box office?