But the slimmed down twosome are now joining forces for the new Weight Watchers 360 campaign and okmagazine.com has your sneak peek look at the video below.
Jennifer has lost and kept off her weight for a couple of years now while Jessica shed her post-pregnancy pounds after giving birth to daughter Maxwell last May.
And in the new commercial airing January 3, Jess, 32, and Jen, 31, strut down the street showing off their physiques while waxing lyrical about the benefits of the popular weight loss regime.
"I was overweight my whole life," Jennifer says in the ad.
"I obsessed about my weight my whole life," Jessica added.
The Oscar winning actress then tells the Fashion Star mentor, who is now pregnant with her second baby, to "get used" to feeling great.
Although Jessica will "not be following the program during the pregnancy" it's clear it helped her drop the weight the first time around.
Watch the new Weight Watchers commercial below and let us know what you think of it…