Christina Aguilera at 40: 10 things you didn't know about her

The singer is no stranger to fame, having burst onto the scene at just 13 on ‘The Mickey Mouse Club’, and continuing to dominate the charts with her powerhouse vocals. . Even with eight studio albums and five Grammy awards under her belt, there are still some aspects of her life we don’t know about. . Here are 10 things you may not have known about the star...