New Game: Celeb Rewind #1

So I have a new game that I have been preparing for for a few weeks. I came across some old photos of celebs when they were younger so decided to play a small game on it. This is only just for fun but please do take part! :D
I have decided to call the game Celeb Rewind and this is the first. I will be posting one every week, so I hope you enjoy and I look forward to feedback or ideas of other games. So here is out first celeb:

Clues:

1. Singer

2. She is now 29

So who do you think this is? Find out who it is after the jump...
The answer is: Christina Aguilera as rightly guessed by Dina. So well done :D