Olivia Mojica has already squared off against Kim Kardashian in a battle of sex tape positions. But now the former American Idol contestant is facing off against one of her own: troubled first season finalist Jessica Sierra.

The singer who can't seem to stay on the right side of the law had no problem staying on the right side - or the left side, or underneath, or on top - of her ex-boyfriend during the filming of their recent sex tape...

Sierra's naked romp on camera should hit stores soon. And when it does, Olivia Mojica will have another celebrity to try to outsell, following in the tradition of Kardashian, Keeley Hazell, Dustin Diamond, Toastee Toof and others.

Which American Idol hopeful turned porn star do you find more attractive?