Karissa Shannon has become popular over the last two weeks after it was revealed she has a sex tape with Heidi Montag. Karissa claims Spencer stole her camera and that's how he got a hold of her lesbian flick with Heidi, but according to TMZ, Vivid Entertainment head honcho Steve Hirsch has received a hot and steamy Karissa Shannon sex tape which features her boyfriend Sam Jones III.

Hirsch tells TMZ he actually laid eyes on the tape which co-stars Karissa's boyfriend, "Smallville" actor Sam Jones III. Hirsch says it was sent to him from "a reputable third party" and that he'd "love to be able to release it."

Vivid's chief isn't divulging who dropped the tape in his lap, but does say he's "very impressed with the quality and content" -- which sounds like executive speak for ... it's smoking hot!

You know Spencer's the jackhole who gave Vivid Karissa's sex tape. She recently said he stole her camera which had her lick flick with Heidi on it, so where else could the new video have possibly come from? Sam Jones has challenged Spencer to a cage fight, which he'll never do because he's a little b*tch.

Keep riding the media train Karissa, cause it's giving you more publicity than you've ever received for banging Hugh Hefner.