Christina Aguilera

Height: 5ft 2.5in
Weight: 7st 3lb
BMI: 18.4 - marginally underweight
Christina Aguilera puts her slim body down to good genes, but admits she has to work hard to maintain her figure, saying, 'I go to the gym for an hour and a half a day. I hate to say it, but a lot of it is genetics and a lot of it is my fast metabolism.' She also admits to enjoying more snacks since she married hubby Jordan Bratman: 'I like fast food, but I've been trying to be a little healthier. I wish I could stop snacking at bedtime, but I seriously can't help it.' Perhaps this is down to her rumoured pregnancy?