Jessica Simpson plans to make "lifestyle" changes to shed her baby weight.

The singer-and-actress - who is the new spokesperson for Weight Watchers - gained over 60lbs when pregnant with her four-week-old daughter Maxwell Drew and because her shape has fluctuated in the past, she's going to diet sensibly.

Jessica - who is engaged to Eric Johnson - said: "I think anybody who's gone through a pregnancy, after they have the baby, it's like, 'I need to do something about this.

"For me, I really want to do something that is a lifestyle, because in the past, I've been known to yo-yo diet."

The 31-year-old beauty also insisted she hasn't set herself a target amount of weight to lose, but will measure her progress according to her shape.

She added: "There's not a goal weight - I just want to feel normal and fixate on inches. I really want to set small goals, so I'm constantly reaching goals and not looking at something so far ahead."

Despite gaining a lot of weight during her pregnancy, Jessica insists she ate healthily but indulged her cravings because she wanted to enjoy the experience.

She said: "I was like, 'I'm going to enjoy my pregnancy,' and I did.

"I ate very healthy, but I did indulge some of my cravings - and that's okay because I know I can work it off now."