Mary-Kate and Ashley Olsen  turn 28 today, marking almost three decades in the Hollywood spotlight. The twins were cast as Michelle Tanner at just 9 months old, and fans recently celebrated the 19th anniversary of the Full House  finale. In their early years, Mary-Kate and Ashley were known for their cute matching outfits, hilarious facial expressions , and many TV and movie roles. The twins have evolved from an adorable onscreen duo to a behind-the-scenes style team, and most recently, the pair took home an award at the CFDA Awards . To celebrate the twins' birthday, find out how many Mary-Kate and Ashley movies you've seen , and then take a trip down memory lane with the ultimate MK-and-A time machine!