Snooki Before and After: Star Shows Off Svelte and Sexy Post-Baby Body (PHOTOS/VIDEO)

Although she infamously spent years partying it up on MTV's "Jersey Shore," since giving birth to her son Lorenzo, Nicole "Snooki" Polizzi has lost a whopping 42-pounds through a revamped diet and exercise regimen. Recently the reality star Instagrammed a photo of her lifting a tire and showing off her muscles and slimmed-down figure, SheKnows reports.

"Getting more toned & defined!! #muscles #fitlife," she wrote as a caption to the Instagram pic. The star has spent months hitting the gym almost daily to get in good shape.

"I go [to a trainer] four times a week, and we do legs, arms and everything," she told People back in January. "And after every one-hour workout, I do an hour of cardio... I'm still working my a** 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."

Jionni LaValle is Snooki's fiance and the father of their son. The two got engaged before the final season of "Jersey Shore," and are currently planning a wedding. In addition to her "Workout Wednesdays" section of her blog, where she shares fitness tips and workout routines in a series of videos each week, Snooki has been posting various pictures to her Instagram showing off her svelte and toned new physique.

Most probably remember Snooki as the wild party girl on "Jersey Shore" who spent her days binge-drinking and looking for love while getting into endless trouble with her crazy roommates. Now the star leads a far more laid-back life, spending time at home with her new family, keeping in shape, eating healthy and limiting her alcohol intake. The new mom stopped drinking right away when she found out she was pregnant, amid gossip and slander that her baby would be poisoned by her heavy drinking.

She's also cut back on tanning, prefering to show off a more natural look, and changed up her style from tacky club clothes to sophisticated and sweet.

Click here to see a video detailing Snooki's transformation.

SNOOKI "BEFORE" HER WEIGHT LOSS

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