Pratt has Montag, 'Playboy' model sex tape?

Spencer Pratt has reportedly uncovered a sex tape featuring estranged wife Heidi Montag and Playboy Playmate Karissa Shannon.

Sources told TMZ that the Hills star came across the recording on a camera while he was packing to move out of a house that he and Montag shared before their separation.

They added that the discovery served as Pratt's inspiration to attempt to sell an alleged tape of the couple themselves.

While the website failed to reach Montag for comment, Shannon confirmed that the footage does exist, but remained unconvinced that Pratt could be in possession of it and promised legal action against him should it ever be distributed.