Heidi Montag returned from her "relationship vacation" today to appear with her worse-half Spencer Pratt on Tyra and plug her various projects (that hideous clothing line, that horrendous music career). Of course Tyra asked them about the rumors of Lauren Conrad's alleged sex tape, and Heidi and Spencer both maintained that it was never a rumor and that a sex tape does, in fact, exist. They wouldn't say how they knew this (Heidi is 100% sure, while Spencer is 1000% sure), but it was implied that Lauren had confided in Heidi about it. I, for one, totally believe them, especially considering that Heidi also has an alibi as to why she couldn't possibly have been the person to leak the information to the press. "I was in surgery that day." Right: Getting her new breasts! Clip above.