Last night, Mary-Kate Olsen was a guest on Dave Letterman’s show.  She was promoting her new movie, The Whackness.  Mary-Kate also revealed that she went to high school with Spencer Pratt, from The Hills.  She talks about his bad temper.  It’s pretty amusing.  Check out the video below.  Also, what is up with Mary-Kate Olsen’s body language.  It is just so weird and awkward. 

Oh, and you know that Spencer is LOVING all of this attention!