Snooki has come a long way since season one of "Jersey Shore."

Not only has she transformed her lifestyle, but also her body -- and in the new issue of Us Weekly, she shows off her 42-pound weight loss!

Nicole "Snooki" Polizzi, who also tweeted a photo of her fit frame last month (above right), says she owes her new body to a heavy workout and diet plan.

The reality TV star and new mom says her main goal was get back to her pre-pregnancy weight of 110 lb ... a goal she went above and beyond.

She now hits the gym with a trainer up to 4 times a week, has an elliptical machine at home and eats an average of 1,100-1,300 calories a day.

"Hard work pays off ... big thanks to my trainer," Snooki tweeted after unveiling her impressive cover photo, where she looks more Maxim magazine than Mom.


Check out more celebrity weight loss photos in the gallery above!

Hot Videos