1. Mary Kate and Ashley Olsen

Best known for sharing the part of Michelle Tanner on the show Full House, Mary Kate and Ashley Olsen are definitely one of the more prominently known twins in today. The two also seem to be the youngest twins to become famous, officially being hired as actresses at the age of six months. After growing up, the sisters went on to star in plenty of movies, television series, and then split to move onto their own careers. The sisters also have dolls, a clothing line, and other items in their names that continue to keep them in the spotlight.