Sellebrity Smackdown: Spencer Pratt's 'Wormy,' Mary-Kate Olsen's a 'Troll!'

Things are getting ugly between "The Hills" star Spencer Pratt and Mary-Kate Olsen.

Mary-Kate Olsen chatted with David Letterman on Thursday night, talking about kissing Gandhi (Ben Kingsley) in "The Wackness," Hollywood's bad girls, not wearing panties (she was!) and "wormy" Spencer Pratt's bad temper.

Spencer_prattShe told Letterman that Pratt played soccer in high school and "he does not have a good temper. He would walk off the field."

"I don't really get why she'd use my name to get press for her little indie film that no one's going to see," Pratt fired back to  Usmagazine.com Friday. "She should probably focus more on not getting dressed in the dark than on me."

But Pratt told Us that Olsen went to Campbell Hall in North Hollywood, and he attended Crossroads School in Santa Monica.

"I know I've made it in Hollywood when a famous troll is talking about me on Letterman," Pratt said. Make that "Troll Doll," you worm!

Oh, you've made it all right, Spencey. But for so, so many reasons other than Mary-Kate's mention

"I forgive her, though," Pratt said. "She's had to go through life as the less cute twin, which must be tough."

Zing. Your turn, Mary-Kate.

Photo: Spencer "Wormy" Pratt has finally made it in Hollywood. But for what?
WireImage