The 33-year-old fashion designer showed off her super slim post-baby body in this red floral dress during an event in New York City last night.
Jessica gave birth to her second child in August and wasted no time whipping her body back into shape.
From the looks of it, Jessica has definitely implemented a workout plan, but we do know she's been watching what she eats, too.
"Couldn't stop smiling on set for my new @weightwatchers campaign today! #happy," she recently wrote on her Twitter page, along with a picture of herself looking super slim in a pair of hip-hugging jeans.
After the birth of her daughter Maxwell, Jessica used the same weight loss company to help her shed 70 pregnancy pounds--talk about an amazing endorsement!
As they say, the proof is in the (low calorie) pudding!
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Gallery | ariana grande