During their peak in the late '90s, The Olsen twins were arguably the most famous child actresses around, starring in widely known films such as It Takes Two, Billboard Dad, Passport to Paris, and Switching Goals as well as numerous direct-to-video movies. The twins also did their fair share of work in television, grabbing starring roles in beloved TV series such as So Little Time, Two of a Kind and animated series Mary-Kate and Ashley in Action!. With their long list of acting credits, along with their ownership of entertainment company Dualstar, its no wonder that the Olsen Twins were some of the wealthiest child stars of their generation.