Mary-Kate Olsen stopped by The Late Show with David Letterman last night to do some promo work for her new 90′s nostalgic movie The Wackness and talked about various things …. from her new movie (which involved kissing scenes with Ben Kingsley) to her advice for Young Hollywood to her former school friend Spencer Pratt — yes, the Spencer Pratt from The Hills. MK had some interesting things to say about the lad she claims she was not friends with (David Letterman asked her point blank if they were friends at the time and she replied “No”) and yet the couple were photographed partying together back in the day:

They were classmates at a posh L.A. high school – and Mary-Kate Olsen doesn’t have fond memories of Spencer Pratt. “He does not have a good temper,” Olsen, 22, told David Letterman, during an appearance to promote her film The Wackness … “He used to play on the soccer team … (and) he walked out of a few games. He would walk off the field.” When Letterman pressed her for more stories on The Hills’s 24-year-old villain (whom Letterman called “wormy” and “oily”), Olsen just giggled and said, “The Wackness is a great film!” As for the rest of young Hollywood, Olsen simply advised: “Wear underwear! Wear your panties.”

The interview is interesting to watch, Mary-Kate seems regretful that she even started talking about Spencer in a negative way in the first place because she remained mum on spilling any further deets the more that David Letterman pressed her. After the jump, check out video of MK‘s interview with Letterman …

I wonder if Spencer will have any follow-up to Mary-Kate‘s interview. I’m sure he has quite a few stories that he could share about her from back in the day … like maybe an explanation of what exactly is going on in the photo of the two of them above?

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