Miley Cyrus, Demi Lovato and Vanessa Hudgens: 15 Disney Stars in Bikinis (PHOTOS)
However, Spears isn't alone in blossoming into a sexy star.
Anne Hathaway has gone from the clumsy and geeky Mia Thermopolis in The Princess Diaries to a prostitute named Fantine in Les Miserables.
The 30-year-old actress was spotted showing off her healthy physique in a blue bikini on a yacht in Italy in 2009. But since then, the actress has lost a significant amount of weight in order to step into the famous role.
She told Vogue magazine that she had been living off of "two thin squares of dried oatmeal paste per day."
Extreme measures aside, Hathaway and the rest of the Disney crew do know how to rock a bikini.
Click through the gallery above to check out your favorite childhood stars in swimwear.