Sizzlin' Pics: The Hottest 25 Stars Who Are 25 & Under!
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The Olsen Twins (24)
What They've Done: Mary-Kate Olsen and Ashley Olsen, better known as the Olsen Twins, began their television career at nine months old when they began filming "Full House." On the hit show, the twosome took turns playing the role of Michelle Tanner. From there on, the fraternal twins appeared in several TV shows, TV movies and feature films. Besides film endeavors, the duo co-founded the luxury fashion brand, The Row, and a more affordable line, Olsenboye.
What's Next: Mary-Kate is slated to star in 'Beastly' and 'Story of a Girl.' Focusing on fashion, style queen Ashley has started her own fashion company called Elizabeth and James.
