Laura Prepon – 39

Laura Prepon is a well-established actress, whose career began in 1997. She is best known from That ‘70s Show, that aired from 1998 to 2006. Laura played Donna Pinciotti, Eric Forman’s love interest who was played by Topher Grace. She is a natural red-head as seen in her character on the show. However, she had made radical changes to her hair color depending on her roles. Laura has been appearing since 2013 in the TV series Orange Is The New Black where her mane has been dyed black. The show is already on its seventh season.