Mary-Kate and Ashley Olsen, aka the Olsen Twins, are perhaps the best-known twins on the planet --and they’re also maybe the richest. They launched their acting careers well before they could even walk, when they were cast at less than a year old to share the part of Michelle Tanner on the hit comedy “Full House.” They were cast for the same role so they could share the part in order to comply with super-strict child acting labor laws.

They recorded their first album, “Brother for Sale,” at just 6 years old. By the time they were 18, they had taken charge of their billion-dollar empire and were on their way to even more impressive heights.  Now in their early twenties the twins have moved to become more independent and pursue their own interests. They remain some of the wealthiest young celebrities in Hollywood.