The Olsen twins' popularity began when Mary-Kate and Ashley were just 9 months old, appearing as baby Michelle on the television show Full House. At just 7 years old, the mini-moguls co-founded Dualstar to market their images to tweens around the world—from DVDs to cosmetics to furniture. At 18, the girls took over the company, estimated to be worth millions.
The twins are now focusing on their passion for fashion—in 2006, they launched a high-end clothing line called The Row, followed by a more contemporary line, Elizabeth and James.
Watch the Olsen twins, one-on-one.