Jessica Simpson Flaunts Cleavage, Major Weight Loss in Tight Dress—See the Pic!

Mom of two using Weight Watchers to help her shed pregnancy pounds

It's kind of hard to believe Jessica Simpson has two kids under the age of two!

Maxwell and Ace's mama showed off her slim, post-baby body in a sexy red and black Carolina Herrera dress at the 27th Annual WWD Footwear News Achievement Awards held in New York City on Dec. 3.

Jessica, 33, paired her flattering floral dress with black Casedei pumps and Lorraine Schwartz jewelry. She presented a Lifetime Achievement Award to her business partner, Vince Camuto.

The previous day, Dec. 2, Jess was snapped looking just as sexy in a chic but slightly less casual ensemble. Leaving an office building in Manhattan, the former Fashion Star mentor looked nearly red carpet ready in a head-to-toe black ensemble and sky-high boots!

And in November, just five months after giving birth to her son Ace, Jess was back in a swimsuit! Her stylist Nicole Chavez Instagrammed a pic of the yummy mummy's white one-piece, which she wore the set of a Jessica Simpson Collection fashion shoot.

The fashionista and working mom got back to her bathing suit bod after giving birth thanks largely in part to her Weight Watchers diet. She has an endorsement deal with the program, which encourages healthy, mindful eating to shed pounds in lieu of fad or crash diets.

Clearly, it's working for Jess!