Spencer Pratt may be in possession of a sex tape after all -- one that doesn't feature himself -- because Playboy Playmate Karissa Shannon is threatening to sue Pratt over some private XXX footage he allegedly stole from her home.
Karissa's lawyer fired off a letter to Spencer -- claiming that he is in possession of footage that was "taken from [Karissa]" and "contains private materials" featuring herself and boyfriend Sam Jones.
Shannon demands that Spencer return the footage ASAP -- or else she'll sue his pants off.
Playmate to Spencer
My XXX Tape!
9/6/2010 4:50 AM PDT BY TMZ STAFF
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