Washington, Apr 24 : Reality TV star Spencer Pratt has reportedly admitted to be the mastermind of the sex tape between his co-star Lauren Conrad and her ex-boyfriend.

Last year Conrad accused Pratt of spreading rumours she had filmed an explicit tape with Jason Wahler.

However, `The Hills' star denied allegations he was behind the hoax.

But Conrad said that he''s been caught on camera admitting it was all a sham.

"We actually have it on tape. He takes responsibility and apologises for it," Contactmusic quoted her as telling the New York Post. (ANI)