Mary-Kate Olsen Splits from Boyfriend

Mary-Kate Olsen Splits from Boyfriend
Nate Lowman and Mary-Kate Olsen
Seth Browarnik/Startraks

updated 02/24/2010 AT 01:00 PM EST

originally published 02/24/2010 AT 12:35 PM EST

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.

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