For many child stars, the road to adult success is uncertain. Lindsay Lohan, Taylor Momsen, Corey Haim, Demi Lovato, and Leif Garrett (currently appearing on Celebrity Rehab) are all cautionary tales about what can happen when someone achieves success at an early age. But there are celebrities who managed to stay grounded and move successfully into adult careers, thus proving that every rule has its exceptions.[ITPGallery]