Ms. Montag has been putting her silicone to use! Spencer Pratt reportedly discovered a camera with some XXX footage of Heidi Montag and former playmate Karissa Shannon getting a little lezzy.

We’re told not too long ago Spencer was at the Malibu house he once shared with Heidi … moving out some of his stuff. Sources tell us Spencer came upon a camera with XXX video of Heidi and Karissa — and the light bulb went off.

Sources say it was then that Spencer decided he could make a fortune selling his “library” to Vivid Entertainment — much of it featuring naked, fornicating Speidi.

As for Karissa Shannon — she tells us such a tape does indeed exist, but she’s not convinced Spencer really has it. Karissa says if the tape ever sees the light of day, she’ll sue the pants off him.

Source