"Something Old, Something New" is the tenth episode of the fifth season of The Hills. It originally aired on MTV on May 31, 2009. In the episode, Heidi Montag and Spencer Pratt prepare for their upcoming wedding, while Lauren Conrad and Lo Bosworth move out of their house. After much deliberation, Conrad decides to attend the nuptials, where she reconciles with Montag after being estranged with one another since the third season. It is the final episode in which Conrad appears, and also marks the entrance of her replacement Kristin Cavallari.