Credit: Instagram

"Jessica's Chair" has to go it alone in this set photo from Jessica Simpson's latest Weight Watchers ad.

Jess, 33, shared the sleek black-and-white shot on February 8, writing, "Too proud to sit down!! Behind the scenes of my new commercial. Thanks @weightwatchers."

The mom of two is a brand spokesperson for Weight Watchers, and she’s also planning her big day with fiancé/baby daddy Eric Johnson. As she explained in a previous ad, “Knowing that I have the wedding coming up is definitely an incentive to stay on my Weight Watchers, keep counting my points, and stay in the gym. I mean, when you see my dress, you’ll know.”

She's already looking amazing in this dress! 

Credit: Instagram Photo: Jessica Simpson With Son Ace in January 2014

In December, Jess told USA Today she was staying fit through working with a personal trainer four days a week for 45 minutes each session, plus hitting the gym, and walking regularly with Eric. It also helps that she has two little ones to chase around, Ace Knute and Maxwell Drew. “With both kids, I'm running up and down my stairs a million times,” Jess said. “Kids can keep your metabolism going.”

They also get you smiling, as Mom showed with this photo with her baby boy on Jan 26. "Ace is the place that I become the annoying kissing mom. All I want to do is snuggle this lil emotional perfect soul! He is a dream!"

Aww! Spending time with a little snuggle bug like Ace is the perfect treat after a hard workout. Maybe even better than a piece of chocolate cake ... or is that pushing it?

SourcesInstagramUs Weekly