Mary-Kate Olsen Trivia: 48 fun facts about the fashion designer! March 9, 2017 By Maria-Elpida Flessa Leave a Comment Mary-Kate Olsen is an American actress, fashion designer, producer, author, businesswoman, and equestrian. Let’s see some interesting facts about her! [Read more…] about Mary-Kate Olsen Trivia: 48 fun facts about the fashion designer!