Letterman, who in the past has clashed with 'Hills' villain Spencer Pratt, seemed genuinely interested in the infinite Lauren vs. Heidi Montag drama on the hit MTV show. When Conrad answered that it had been going on for years, Letterman put a screeching halt to the interview by saying: "Maybe you're the problem." Conrad, visibly annoyed by the comment, then attempted to backpedal. Check it out for yourself and cringe:
