Who is the guy seen hanging out with Mary-Kate Olsen last week in Paris? According to Star mag, the mystery guy is oil heir Maxwell Snow of the de Menil oil family of Texas. Snow is also the son of Uma Thurman's older half-sister, Taya Thurman. Sources say Olsen hopes to keep her new relationship quiet. "Every time she gets a boyfriend, the media make it impossible for it to be a normal relationship, and she's probably scared that all the attention would scare him away," said an insider. "It's happened before, so she's not making any public appearances with him yet."source