Kirsten Cracks Us Up!

X17 photogs caught up with sometimes actress Kirsten Dunst leaving the Chateau Marmont with her b/f and some friends last night and, well, she definitely thought the whole thing was hysterical!

From our photog: "Kirsten came out from the back and I immediately recognized her, even though she was trying to hide at first. Then she just kept laughing and laughing about who knows what! I'm guessing she had a very fun time at the bar with her pals."

And we'd hafta agree!