It's no secret Mary-Kate Olsen is on the cutting edge when it comes to fashion, so it's no surprise her new rumored beau is a shoe designer -- a sneaker designer to be exact. The actress is rumored to be dating designer Seth Campbell, according to Us Magazine.

"Their relationship is fairly new," a source close to the couple said. The pair have been spotted at various NYC hotspots, including a friend's birthday party at Lavo where the couple reportedly made out all night.

"They've been able to have a few dates on the down low," the source continued. "He's a downtown kind of guy, likes to party every now and then."