Spencer: Heidi Made Sex Tape With Playboy Model

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 Steven Lawton/FilmMagic; Michael Bezjian/WireImage.com

A new twist in the Speidi sex tape saga: Spencer Pratt claims he has footage of his ex Heidi Montag getting it on with her pal, Playboy Playmate Karissa Shannon.

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Pratt, 26, tells TMZ.com he was picking up some of his belongings from the Malibu pad he once shared with Montag, 23, when he found the X-rated footage.

Shannon, 20, tells TMZ a tape exists, but she doesn't believe Pratt has a copy.

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This is now the third tape that has allegedly surfaced featuring The Hills star. The first two supposedly star Pratt. One features a pre-surgery Montag; the other was filmed after she underwent her infamous 10 cosmetic surgery operations last year.

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Over the weekend, Pratt and Montag got into a cussing fight – via Twitter – over the tapes.

In July, Montag filed for divorce after one year of marriage, citing irreconcilable differences. Their divorce is expected to be finalized on Valentine's Day of next year.

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