Gerard Butler & Jennifer Aniston’s Dirty New Photo Shoot!

Gerard Butler and Jennifer Aniston get down and dirty for a photo spread in the new issue of W magazine.

In the photos, “The Bounty Hunter” stars braved the searing heat of the California desert for some sexy role-playing shots, based on the characters in their upcoming romantic comedy.

In the hot shots, which were taken in January on a ranch about 45 minutes outside of Los Angeles, Jen dons a few slinky outfits in the shot, with Gerard dressed up as the man hot on her heels.

And as it turns out, Jen had to take a few extra steps – or rather not take a few steps – to help add to her dirty look.

According to Jen’s longtime hairdresser Chris MacMillan – the man responsible for the famous “Rachel” cut, who was by her side during the W shoot – Jen was asked to keep her hair unwashed despite the dust and dirt on the ranch.

“At the end of the first day [photographer] Steven [Klein] came up to me and goes, ‘Could you please ask her if she could not wash her hair tonight and just show up tomorrow?’” MacMillan told W. “I mean, she was rolling in the dirt, it was windy and she had hairspray in her hair.”

In an interesting Hollywood connection, Klein was also the photographer on Brad Pitt and Angelina Jolie’s sexy “Mr. and Mrs. Smith” Palm Springs photo shoot in 2005.

But despite the less than posh conditions for Jen and Gerard’s shoot, MacMillan said the actress was nothing but a great sport.

“Jen’s always really super game,” he added. “Steven’s so cinematic about his photographs, and she’s an actress. It’s all reminiscent of an old movie.”