Sienna Miller and Josh Hartnett: London Hookup?

Unremarkable 30 Days of Night stud Josh Hartnett has been having quite the time in London while performing in a West End stage version of Rain Man.

First he’s rumored to have had sex in his hotel’s library with an unnamed woman. Then he had an encounter with worldly philanthropist Mischa Barton.

But Hartnett might be in over his head with this latest one.

The actor was photographed leaving London’s Jalouse night club at the same time—but in seperate cars—as homewrecker and graffiti magnet Sienna Miller.

This seems like a natural course of events since a.) Miller and her married lover Balthazar Getty appear to be on the outs, and b.) Josh seems like a manwhore.

Well, you gotta hand it to Hartnett—he sure knows how to pick ‘em.

Than again, Sienna apparently might the one handing it to him now.