A source says the star was smooching Josh Hartnett at a party recently

By Steve Daly
February 24, 2010 12:35 PM
Seth Browarnik/Startraks

While she’s busy checking out London Fashion Week frocks, is Mary-Kate Olsen also shopping for a new boyfriend?

A rep for the 23-year old actress has confirmed that she’s no longer dating her onetime beau, Nate Lowman, who she started seeing back in 2008. The National Enquirer reports that the couple split before Valentine’s Day. They were seen on Feb. 4, walking together in New York City.

But Olsen doesn’t appear to be nursing a broken heart. She was spotted at the Weinstein Co. and Universal Pictures post BAFTA party in London last weekend, smooching actor Josh Hartnett, according to a source.

“They were making out in a dark corridor of the party,” the source says. “Everyone danced all night.” Olsen’s rep has denied the two were kissing.