Jessica Simpson Shows off Tiny Waist in Sassy New Post

Jessica Simpson is showing off her tiny waist! The 37-year-old mom of two shook her hips in an Instagram video on Tuesday.

In the video, Simpson wore a maroon leather skirt paired with a blouse tied up beneath her cleavage, showing off her toned abs.

Color ✔️ #LockAndBlock ✔️ 👯 ✔️ Love You @ritahazan

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The ab-baring look has been a common theme in Simpson's fashion-forward ensembles this summer, from toddler birthday parties to styled social media shots.

Simpson says she uses a special mind trick to motivate herself to hit the gym and stay fit. "I give myself so many excuses to not get on that treadmill, to not do that lunge," she told Women's Health last year. The thing that does get her going? The mentality that "workouts are an emotional experience. I exercise to clear my head. It makes me stronger on every level."

She also says that every other day her workouts entail six miles on the treadmill, plyometrics or TRX (to elongate her muscles) and intricate BOSU ball moves (for balance and to strengthen those rarely-used muscles).

So while she may be sculpting her core on the BOSU ball or on the TRX ropes, she sees it as a way to get her mindset right.

Motivation = Super Bowl Sunday 🍕🌭🍔🍪🍫🍺 @jessicasimpsonstyle

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And while Simpson's figure is as hot as ever, she'll be the first to tell you that she knows from experience what it's like to be not so lean and sculpted.

During the creation of her athleisure line, The Warm Up, she says each piece was designed with every woman in mind.

"I have been every size there is, so I know what looks good on a variety of body types," she told Women's Health. "Every woman should feel like she can wear what the model is wearing down the runway."

Photo Credit: Instagram / @accesshollywood