Sienna Miller, Alexander Skarsgard open 2010 Esquire House

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British import and fashion plate Sienna Miller did her part to celebrate bachelors everywhere on Friday evening -- and not just by leaving Jude Law at home.

The actress helped open Esquire magazine’s pop-up house for the eighth consecutive year, a swinging $18.9-million home -- billed as the ultimate bachelor pad -- in the Hollywood Hills.

Miller’s male counterparts in the movie biz helped celebrate the space, including Aaron Eckhart, who roamed the party solo with a cigar. Calvin Klein spokesman Mehcad Brooks huddled in a corner with a female friend while singer John Legend was a huge hit with the crowd handing out business cards and shaking hands. (Click the photo of Eckhart below to launch a gallery of red carpet arrivals.)

The undead were represented by ‘True Blood’ star Alexander Skarsgard, but he wasn’t there to enjoy any spoils of single life -- his main squeeze Kate Bosworth attended as well, the pair keeping a healthy distance all evening in step with their uber-private romance.

Miller was hostess for Esquire’s grand-opening benefit for International Medical Corps. Other stars that showed included ‘Desperate Housewives’ star Felicity Huffman, Marlon Wayans and actress Michelle Rodriguez.

-- Matt Donnelly
Twitter.com/MattDonnelly

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