Celebrity Birthday Hair & Beauty: Mary-Kate & Ashley Olsen

Arguably the most fashionable twins on the planet, Mary-Kate and Ashley Olsen are celebrating their 27th birthday today. Hard to believe considering they've jam-packed so much into their young lives already. Actresses, authors, fashion designers and style icons, the dynamic duo have always been quite different in their hair and makeup aesthetic with Mary-Kate being more daring with her hair hues and Ashley preferring a more polished look. Take a look back at the birthday girls and their boldest beauty looks throughout the years.