Mary-Kate and Ashley Olsen: Happy 25th birthday

Mary-Kate and Ashley Olsen celebrate their 25th birthday on Monday (June 13).

The twins -- in a mere quarter of a decade -- have gone from cute kid actors to mysterious prodigies steering their own empire. What started as a clever marketing idea -- sell the heck out of these adorable twins -- has evolved into a high fashion powerhouse with no sign of slowing down.

What will the next 25 years bring for Mary-Kate and Ashley Olsen? Share your predictions below, and be sure to check out our Mary-Kate and Ashley: 25 photos for 25 years gallery.