Lauren Conrad's Ex Comes Back to The Hills

No Laguna Beach boy caused a stir like Stephen Colletti . On tonight’s episode of The Hills , Lauren Conrad ’s (and Kristin Cavallari ’s!) beloved ex returns. In the exclusive clip above, Conrad tells pal and new roomie Lo Bosworth that she and Colletti, her ex from Laguna Beach days, are spending time together again. "You're hanging out?" Bosworth responds excitedly. "That melts my little black heart." Sure it makes Bosworth happy , but how does Conrad – who admits she "never stopped" liking Colletti – feel? "It's not a 'thing,'" she explains. "Because when it turns into a 'thing,' then there's a buildup. And I get my hopes up." Ever the optimist, Bosworth counters: "Then I'll get my hopes up for you!" Check out The Hills love lives exposed here . Talk to Us : Should Stephen and Lauren date again? (link)