When Laurence Fishburne's daughter Montana Fishburne released her sex tape on Vivid, she cited Kim Kardashian as her skinspiration, saying, "I've watched how successful Kim Kardashian became, and I think a lot of it was due to the release of her sex tape."

It seems that fame-hungry, mountain-mammed reality hottie Heidi Montag agrees, and is about to give Kim and Montana a run for their triple-X money!

You can't deny that Heidi is absolutely smoking hot, and we've been dying to see more of her nude following her stint on The Hills and her Playboy spread. Now, if the rumors are true, she's shopping around a couple of sex tapes--one with estranged husband Spencer Pratt, and one with Playboy model/twin/former Hef consort Karissa Shannon.

Spencer is allegedly shopping the tapes to Vivid, and wants $5 million for them. Blonde Karissa has confirmed that a tape of her cavorting with Heidi does exist, but she doubts Spencer is actually in possession of it.

This promises to be the hole-y grail of sex tapes, and as soon as it's released, we'll have it here at the site. It's worth noting that Heidi looks an awful lot like Karissa, so it'll be easy to pretend Karissa is with sister Kristina Shannon. Twincest: it's breast!