The 33-year-old mother of two revealed a photo of her in a figure-hugging black dress before making an appearance on 'Good Morning America', reported Ace Showbiz.
"Good Morning, America! Going live soon... Weight-watchers," she captioned the snap.
Simpson, who became a spokesperson for the company, talked about regaining her weight after welcoming two children and her wedding plan on the talk show.
"I had already been on Weight Watchers and I had already lost over 50 pounds, so I wasn't as relaxed in my eating and everything that I was with Maxwell," she said, referring to her second pregnancy with baby Ace.
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Simpson also dished on her plan to get married to her football player fiancee, Eric Johnson (II).
"We need to get married. We don't have an actual date but we do know that we want it to be this year."
Simpson then added, "I already feel like we're like an old married couple already. If he wanted to run, he could have run when I was hormonal and pregnant.