The singer showed off her post-baby body in this pic from a Weight Watchers photo shoot.
"Couldn't stop smiling on set for my new @weightwatchers campaign today! #happy" she captioned the photo.
We bet the people at Weight Watchers can't stop smiling, either--what an incredible testimonial!
As for Jessica, she has a lot to smile about these days, too!
She and fiance Eric Johnson just welcomed their second child, Ace Knute Johnson, in June and the duo is reportedly in the process of scoping out wedding locations.
Jessica took a lot of flack for the weight she gained during both of her pregnancies, but judging by recent photos of her, it looks like she got the last laugh!
Gallery | Celeb Slimdowns