Letterman "Kinda Wanted to See" Lauren Conrad Sex Tape

Few comedic formulas can top David Letterman and The Hills.

Forced to talk about the MTV reality show, which he knows next to nothing about, other than hating Spencer Pratt with a passion, the Late Show host was in rare form last night when interviewing its leading lady, Lauren Conrad.

In this clip from last night's show, Letterman decries that "snake" Spencer for making up rumors about LC engaging in "sexual activities" on video, but admits that, being the kind of guy he is, he "kinda wanted to see it."

Lauren's reaction to that comment? Not un-priceless.

Dave went on to ask about this weekend's Speidi wedding, as well as how that "load" Brody Jenner is doing. The conversation only got more absurd from there.

Peep this two-and-a-half-minute excerpt and see ...