So You Think You Can Dance? Not If You're Bai Ling!

No, Bai Ling isn't suffering from convulsions ... she's just trying to dance.

TMZ was at the trainwreck-heavy birthday party for porn star Mary Carey Friday night at Club Play, where the "Lost" guest star was quick to show off her "moves" on the dance floor.

Nice try Bai, but girl makes Paris Hilton look like a member of the Bolshoi Ballet.