Mary-Kate’s Been Taking Lessons from Farrah Fawcett

Disheveled, rambling and too pooped to pop—no, it wasn’t Amy Winehouse, for once—Mary-Kate Olsen appeared on Late Show with David Letterman last night. She probably should have been at home sleeping off whatever was ailing her.

Olsen tried to excuse her demeanor by claiming she was “so tired” from flying in and “working on a show,” but the no-nonsense host would have none of it, noting that he had “been here since 78.”

Poor Mary-Kate. She’s probably just wiped from not talking to sister Ashley and making out with Ben Kingsley.

Luckily,  she pulled it together long enough to scoop on her old schoolmate, The HillsSpencer Pratt, who played on the soccer team with her. Apparently, Spencer—whom Letterman had lambasted on a previous show—”does not have a good temper” and “would walk off the field” when things weren’t going his way.

Whoa! That fact is a little unsettling, taking his fondness for guns into consideration. Maybe he’ll end up slapping leather with this chick.

Check out M.K.’s appearance.