Audrina's Hills Are ALIVE!

The hot rumor on "The Hills" was always that Lauren Conrad had a sex tape -- but who knew that it was Audrina who was the really naughty one all along? O. M. G.

TMZ obtained this snap of Audrina looking every bit the dirty schoolgirl, and taken, we hear, before "The Hills" and just after A-Pat graduated from high school. She'd done some bikini modeling, but decided to go the full Audi to have a go at Playboy. It wasn't like she needed the money, as anyone who watches "The Hills" knows.

In a statement made through her rep, Audrina tells TMZ "I took these photos years ago when I was just out of high school and beginning to model. I was young and very trusting of others and I didn't know to protect myself. It is a lesson learned, for myself, and hopefully for the young girls who look up to me."