In (Doggy) Style: Olivia Mojica, Kim Kardashian, Paris Hilton Pose for the Camera

Oliva Mojica must have done some research before hitting "record" on her sex tape.

After all, the former American Idol contestant and her boyfriend, Adam Roberts, appear to have studied the moves of Kim Kardashian nude and Ray J in their infamous railing in the sack.

There's a certain similarity in the sex photos below, isn't there?

Where might each gal have gotten the idea to bend over on camera? Well, from Jenna Jameson or any porn star, of course.

But Mojica and Kardashian each look to be copying the queen of the crotch shot, the skank that truly got the celebrity sex tape train rolling, Paris Hilton…

As you can see here, some dude - who didn't even bother to take off his jeans - is lined up behind the hotel heiress, following the style of a dog, as Paris looks bored.

She's probably counting the minutes until the next partner arrives.

As soon as we uncover still images from the Keeley Hazell sex tape, we'll compare those, as well. But here's a note to all future wanna-be porn stars:

Be original. Find a new position.

Got that, Katie Price?