It’s like being in the wonderful world of porn where stories keep changing every other minute.

from www.radaronline.com – Playboy playmate Karissa Shannon is accusing Spencer Pratt of stealing her video camera containing the alleged sex tape featuring herself and Heidi Montag, RadarOnline.com has learned exclusively.

While out to promote her new signature milkshake with boyfriend Sam Jones III at Millions of Milkshakes in West Hollywood on Thursday, Karissa confirmed to RadarOnline.com, “there is a sex tape of me and Heidi,” emphasizing that Spencer was not present when they shot it. “It’s just me and Heidi, that’s it,” she said.

For more than a week, Spencer has been taunting the media and his estranged wife Heidi, threatening to release the tape.

But According to Karissa, Spencer doesn’t even own the tape, and she tells RadarOnline.com that he stole her video camera containing the footage.

“Me and Heidi were hanging out at her house in Malibu and he came over to pick up some stuff and he ‘accidentally’ took my camera,” Karissa told RadarOnline.com. “I talk to Heidi every single day and I tried to be there for her when she was going through her divorce, but now it’s starting to affect my life. Spencer had no right to steal my camera. There are other things on there that I don’t want to come out, including the video of me and Heidi.”

Karissa told RadarOnline.com that she has no plans to promote the tape and doesn’t “want people to see it.”

She does, however, have one regret.

“I don’t know, I just wish I’d done it [the sex tape] with Lindsay Lohan,” she quipped. “At least it wouldn’t be on the market right now!”

Watch the video on RadarOnline.com: www.radaronline.com/exclusives/2010/08/radar-video-interview-playmate-admits-i-made-a-sex-tape-with-heidi-and-spencer