Mary-Kate Olsen and Ashley Olsen on the Upper East Side

Ashley and Mary-Kate Olsen Team Up on the Upper East Side

Mary-Kate Olsen flashed a smile as she walked with Ashley Olsen.

Mary-Kate and Ashley Olsen were a study in contrasts today as they headed out together in NYC's Upper East Side. Ashley wore a neutral maxi dress, while Mary-Kate paired her new tan with a black shirt and skinny, dark jeans. The sisters and business partners did have their signature to-go coffee cups and oversized sunglasses in common. It's been a busy Summer for the pair, and while Mary-Kate's new glow might be the result of a well-deserved getaway, she and Ashley have been hard at work on their fashion empire for the past several months. Not only did they just launch their new shopping site StyleMint with a collection of t-shirts, but they're also introducing handbags to The Row and were nominated for a CFDA award.