Jessica Simpson, 31, is the new North America ambassador for the points-based weight loss programme and joins the likes of Jennifer Hudson, who also fronts campaigns for the brand.
The former singer will trade “yo-yo dieting for a healthier lifestyle”, according to a Weight Watchers spokesman.
Jessica Simpson has already started on a healthy eating regime – although she is not yet able to exercise on doctor’s orders until she fully recovers from her C-section.
She spoke to the new edition of People magazine, in which she appears in a photoshoot with daughter Maxwell Drew and fiancé Eric Johnson.
Jessica Simpson revealed she is eating simple meals, including shrimp with sautéed spring vegetables and quinoa.
She is also drinking home-mixed juices, her favorite being kale, spinach, apple, ginger, romaine, celery and carrot combo.
Talking about how she is anxious to shed her baby weight, Jessica Simpson told People magazine: “After you have your baby it’s like, <<Oh my God, what happened to my body… this is not me>>.”
Jessica Simpson revealed she planned to join Weight Watchers before she learned she was pregnant.
Her weight has yo-yoed over the years and she is keen to feel comfortable in her skin again.
She went on: “It would be nice to feel comfortable in a bikini, but that’s not my goal. I just want to fit into jeans.”
While Jessica Simpson is not allowed to exercise yet, she admits she has failed in keeping her hands off her future husband, former NFL star Eric Johnson, 32.
“I’ve kind of broken one rule,” Jessica Simpson confessed about not being able to abstain from sex.
“I think I have the sexiest man in the world. So that’s the rule I break.”
Elsewhere in the interview – which featured the first photos of baby Maxwell Drew who was born on May 1 weighing 9lb 13oz – Jessica Simpson said she gets withdrawal symptoms when she’s not breastfeeding her daughter.
She said: “It’s become a full-on job. It’s the worst if I have to pump and give Eric a bottle to give her. I miss holding her and having that closeness.”
Since becoming parents, Jessica Simpson admits her and Eric Johnson’s lives have changed completely.
“Life has completely changed. From how I sleep to what I think about, Maxwell has definitely taken over everything!
“We stare at her all the time. We can’t get enough.”
The couple also has wedding plans to think about, and may wed by the end of the year, although Jessica Simpson says they have still not set a date.
She added: “I want to feel really great in a wedding dress,” which will no doubt giving her inspiration in her new Weight Watchers mission.
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