Mary-Kate is Drunk, Composed

Mary-Kate Olsen joined fellow Young Hollywood party people at Foxtail Lounge in Hollywood last night, and proved that she probably is about as much of a lightweight at the bar as on the scale. 

Check out this 100% priceless footage of her falling ass-backwards onto the ground as she tries to climb her way into the big bad SUV...



Hair of the dog, Mary-Kate, hair of the dog.  I expect to see you back in action by 10 PM tonight.