Today, we're wishing Hollywood's favorite twins a very happy birthday! That's right—Mary-Kate and Ashley Olsen, the stylish pair we've seen grow up from sassy toddlers on Full House to leading ladies in cult favorites Passport to Paris and Billboard Dad, have hit the big 2-8. Since conquering TV and film, the Olsens have successfully taken their love of fashion to the runways with the launch of their clothing lines, Elizabeth and James (have you seen their cute World Cup–inspired collection?), The Row, and Olsenboye. The sisters are undoubtedly style icons: They single-handedly reignited "boho-chic" and are considered poster children for the unapologetic fashion trend normcore.
In honor of their 28th birthday, we're taking a look back at how Mary-Kate Olsen's and Ashley Olsen's styles have evolved. Click through our gallery to see how they've had their poses perfected since 1991!