With new episodes on the horizon next week, Hills girl Lauren Conrad appeared on the Late Show with David Letterman Tuesday night. The two talked about "engorged thing full of blood"—no, not Brody Jenner, but ticks roaming the hills of LC's Orange County homeland. Wearing a one-shoulder dress from her Lauren Conrad collection, a poised LC answered a clueless Dave's questions about Heidi and Spencer, saying that her initial insistence that Heidi be part of the show was "maybe not the best decision." MTV execs might say otherwise.