Sienna Miller sets sights on Hartnett

Sienna Miller has been spotted flirting with Josh Hartnett.

The 27-year-old actress was celebrating the start of New York Fashion Week at the DeLeon Tequila party at Rose Bar last week when she was seen approaching the 'Black Hawk Down' hunk.

A source told FOX News: "She arrived with two men and sat at a table right in front of the stage. In the middle of rocking out to the music that was playing, she eyed Josh and instantly leapt out of her seat to shower him with a public display of affection."

Josh, 31, seemed thrilled with the attention, and was quick to return her advances.

Sienna's pals were said to be less impressed by her display, but eventually left her to it when they realized she couldn't be persuaded to leave.

The party - which saw goth rockers The Cult give a special performance - was attended by a host of other famous faces, including actor Hugh Grant, socialite Nicky Hilton and supermodels Helena Christensen, Alek Wek, and Bar Refaeli.

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