Gwen Stefani admits obsession with weight

The singer kept up her gruelling exercise regime until two weeks before the birth of son Kingston.

And she regained her pre-pregnancy figure in just three months with the help of a personal trainer. Stefani, 37, told Elle magazine: "I worked out with my trainer throughout the whole pregnancy until about two weeks before.

"I cried during my last session. I was like, 'I can't breathe, I can't do this any more. What am I doing?' It was crazy. All of my life I've had to work hard to stay in shape. I've always struggled with it.

"I was a little chubby when I was younger and I didn't want to be that person forever. I'm extremely vain - I like wearing cute clothes."

Kingston, her son by husband Gavin Rossdale, is now eight months old. Stefani said of her mission to get thin again: "There aren't any tricks, it's simple maths - you put this much food in, you burn that much working out.

"I gave myself three months - but if I didn't have an album coming out, there's no way I would have got back into shape in that time. I worked out with my trainer five days a week, with weekends off. I would really recommend doing weights."

The former No Doubt star said the size zero trend "sucks". But she admitted to an obsession with her weight.

"Clearly, I spend time thinking about it and it's something I've had to deal with in my life. As I get older I try not to focus on it. It's boring, it's a waste of life. What I have learned is that whether I'm fatter or thinner, people seem not to mind, they like me either way. It's more in your own mind than anyone else's."

Stefani is the latest celebrity to slim down in super-quick time after having a baby. Victoria Beckham, Liz Hurley and Anna Friel all regained their figures within a few months of giving birth.