Nicole "Snooki" Polizzi showed off post-baby body, flaunting her tiny waist and toned biceps on Instagram.

"Getting more toned & defined!!" she wrote as a caption. "#muscles #fitlife," she tweeted.

The Jersey Shore star and mom to 10-month-old Lorenzo, announced a 44 lb. weight loss in January.

In a second image, Snooki flexed her biceps and said she was "damn proud" to be a "fit mom."

The former party girl is shaping up and exercising with New Jersey-based trainer Anthony Michael.

She defended her athletic figure via Twitter June 25. "Everyone's saying the 'new fit me' isn't what I'm suppose to look [like]," she wrote. "I wasn't always a fatass, kids. Get used to my fit life, cause I love it!"

Just a few days prior, the former Jersey Shore star posted a shot of herself in a workout ensemble, lugging around a huge tire.  "How I start my Saturdays ... #buns & guns," Polizzi wrote.  

Snooki unveiled her 42-pound weight loss on the March 18 cover of Us Weekly. "I feel great," said the star, who welcomed son Lorenzo in August 2012 with fiance Jionni LaValle. "I have a lot of energy because I work out so much and the endorphins put me in a good mood. And when you're skinnier, you feel so much better about yourself." 

In January, the TV personality told PEOPLE about her dedication to fitness. 

"I go [to a trainer] four times a week, and we do legs, arms and everything," she said "And after every one-hour workout, I do an hour of cardio ... I'm still working my ass off, but it's all worth it. I'm now motivated and I want to change my body. It's a good feeling to work out because I feel much better. Plus, my guy Jionni likes it." 

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