Mary-Kate and Ashley Olsen have expanded their growing fashion empire yet again. Last week, the dynamic duo showed off its finesse for luxe clothing with its Spring ’12 The Row collection, and today, the designers announced they are stepping into new, more comfortable shoes as the creative directors for Italian sneaker brand Superga, now licensed by the Olsens’ longtime collaborator Steve Madden. The designers are promising a return to Superga’s luxe roots, starting with The Row for Superga for Spring 2012.