Celebrity Transformations Happy Birthday, Mary-Kate and Ashley Olsen! By InStyle Editors InStyle Editors Facebook Instagram Twitter Our editors and writers comprise decades of expertise across the beauty, fashion, lifestyle and wellness spaces in print and digital. We prioritize journalistic integrity, factual accuracy, and also having fun with every story we share. InStyle's editorial guidelines Published on June 13, 2012 @ 10:40AM Pin Share Tweet Email Photo: Warner Bros/Everett Collection; Larry Busacca/Getty Images Double up the birthday cake—Mary-Kate and Ashley Olsen turn 26 today! To celebrate, we're taking a look back at the twins' Hollywood transformations, from Full House babies to award-winning fashion designers. See their evolution in the galleries! MORE:• Mary-Kate and Ashley Win at the CFDA Awards• Celebrity Bikinis 2012: Ashley Olsen• Preview the Olsens' Fall Collection for The Row