By Breaking Celebrity News Staff

Jessica Simpson will continue to endorse Weight Watchers despite recently announcing her pregnancy, as the expectant mom says she'll use the diet program to get the great results she did the first time around, having shed "more than 50 pounds" following the birth of her daughter Maxwell May 1.

In a 30-second ad released Wednesday, Jessica says, "This year is all about new beginnings for me … being healthy has become a part of who I am, which is great timing, because I'm having another baby … I feel like I'm on top of the world."

She continued, "When a weight loss program is built from human nature, you can expect amazing" results.

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The company noted that the beauty "will not be following the program during the pregnancy while her weight and well-being are monitored by her obstetrician," but she will get back on it after she gives birth again.

Jessica's post-baby weight loss came via a combo of diet and exercise with her trainer, Harley Pasternak.