The rumors of a Lauren Conrad sex tape refuse to go away for two reasons — Heidi Montag and Spencer Pratt. On the The Tyra Banks Show, Lauren’s bitter enemies and co-stars of The Hills insisted that intimate footage of Lauren and her ex-boyfriend Jason Wahler did exist at one time. “I know for 100 percent fact that it did exist,” Spencer, 24, announced. “I know for a fact —and I would take a lie-detector test.”

Read more about The Hills' feud in the latest issue of Life & Style, on newsstands now!