Maybe they're just friends, maybe they're not. But Jennifer Aniston and Gerard Butler definitely got down, dirty and downright smoldering for the W Magazine cover!

How dirty? Literally pretty dirty. Jennifer's stylist, Chris McMillan, was instructed by famed photographer Steven Klein, not to wash her hair. The result? Raw sexiness.

"At the end of the first day, Steven came up to me and goes, 'Could you please ask her if she could not wash her hair and just show up tomorrow?'" McMillan recalls.

The Bounty Hunter actress was all too happy to oblige - and just look at the results. If Jennifer Aniston and Gerard Butler were any hotter, well, they'd be Brangelina.

Ironically, Jen and Gerry's cover shoot was done by Klein, who shot Brad Pitt and Angelina Jolie, '60s family style, for the mag in 2005. Begging the question ...

Which W Magazine cover couple is hotter?