Mary-Kate Olsen dating shoe designer?

Mary-Kate Olsen has been spotted on a string of dates with shoe designer Seth Campbell in New York and even invited him to her younger sister Elizabeth’s 22nd birthday celebrations.The 24-year-old actress-and-fashion designer who split from artist Nate Lowman in February 2010 after a two-year relationship was spotted with Campbell at Lavo restaurant and nightclub in New York, reports