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.

"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," said Jessica, who is engaged to Eric Johnson.

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. "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," she added.

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. "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," she said.