Lauren Conrad appeared on David Letterman last night and he asked if she may be the reason behind the many conflicts on The Hills. When the topic of Heidi and LC’s famed feud was broached, she responded that it wasn’t just Heidi but the entire cast that can’t seem to keep the cat claws in. David Letterman then asked: “It raises the question…I mean, maybe you’re the problem….?”

more photos after the jump…