Not that they ever really left, since we post photos of them every single day, but Lauren Conrad and the rest of The Hills girls return tonight.

To MTV, that is. The fourth season stars at 10 p.m. EST.

One of this season's top stories is the introduction of a boyfriend from Lauren Conrad's past - who we all know to be Doug Reinhardt.

What do you think will take place between these two?

Elsewhere, Heidi Montag and Spencer Pratt are playing house, fighting with each other, and probably still talking about the LC sex tape.

FEARSOME FOURSOME: The Hills girls are back for a fourth season!

LC's co-worker and confidant, Whitney Port, has graduated college and is sweating her stressful job, as well as being newly single.

In other dating news, Audrina Patridge has a boyfriend of her own. We know she is dating Corey Bohan now, but don't know what guy she was dating when this particular episode of The Hills was filmed. It's hard to keep track.

Meanwhile, in a completely unscriped move, Stephanie Pratt makes a play for Sean-P, guitarist for the band White Tie Affair, which will perform.

We're looking forward to watching right along with you. Tomorrow morning, we'll have our typical, in-depth recap of all The Hills drama/comedy. For now, click to enlarge these new, promotional photos of the cast we love below ...