Despite Heidi Montag and Spencer Pratt's persistent contrary claims, Jason Wahler insists a sex tape starring he and Lauren Conrad does not exist.

"I do not have a sex tape of Lauren Conrad and one does not exist," said Wahler in a statement, according to Us Weekly.  "Spencer Pratt is lying again to get attention.  Lauren is my friend, and it is insulting to her to suggest this."

Wahler went on the offensive following appearances by Pratt on both American Idol host Ryan Seacrest's KIIS-FM radio show on Monday and Tuesday's The Tyra Banks Show, in which he insisted that a sex tape featuring Wahler and Conrad did exist at one point

While Pratt and Montag claimed to have never actually seen the tape, both stated they know for certain it existed.

"I know for 100% fact that it did exist -- 1,000%," said Pratt on The Tyra Banks Show.  "I know for a fact, and I would take a lie-detector test because I know."

"It was not a rumor, that's all I have to say," added Montag.  "From what I heard from confirmed sources is that [Wahler] was going around trying to sell it."

Conrad has continuously insisted that a sex tape with her and Wahler does not exist, and has also previously alleged her much publicized ongoing tiff with Montag began when she and Pratt began spreading rumors about the alleged sex tape.