Christina Aguilera Is 31 Today!

Happy Birthday Christina Aguilera! We’ve watched the 31-year-old grow up from her days on The Mickey Mouse Club to being named one of Rolling Stone’s 100 Greatest Singers of All Time. Now let’s take a look back at everything the Grammy winner-UN Ambassador-mother has done in between. Check out the gallery of her transformation!

MORE: • Our Top 10 Favorite Party Hairstyles• 5 New Year’s Eve Makeup Ideas• Try On Christina Aguliera's Hairstyle!