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03/06/2014 09:27 am ET | Updated Mar 06, 2014

Jessica Simpson Stuns In A Tight White Dress In New Weight Watchers Ad

Jessica Simpson is looking white hot in her latest Weight Watchers ad.

Weight Watchers posted a photo of Simpson on the set of the company's newest shoot to Instagram on Wednesday, March 5. The 33-year-old star looks white hot in a tight ivory frock and nude pumps, with her bright blond hair in waves.

"The #powerofsupport is one reason Ambassador @JessicaSimpson loves attending Weight Watchers meetings," the caption read in part.

In the ad, Simpson said, "It's so much better to have some back up and to do it together because we all face similar challenges. The meetings keep me focused and motivated, and I have a newfound determination that I'm really proud of."

"I can honestly say I've never been happier," she added.

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