Angelina Pivarnick is getting her GTL on.

The former Jersey Shore star took to Instagram on January 23, posting a photo of herself looking slim in workout clothes.

"Gym mode :) down 15 pounds. Find out how!!" she wrote, along with the selfie.

So what's Angelina doing to get in such good shape? According to her Twitter, she's been drinking shakes and doing a cleanse. Earlier in the month, she wrote, "Gotta keep at this cleanse. It's a little  difficult the first day or two but then it gets easier. Watching the weight come off is rewarding."

She also posted a photo of one of her meals and wrote, "Everything ON the side because the rice I can't won't eat. It's called saying no and keeping your body on the right track #CLEANSE."

As for what cleanse Angelina is doing? She posted a photo of an achievement certificate for becoming a consultant at Isagenix International — a company that offers products for "solutions for weight loss, energy and performance, youthful aging, Age-Defying Skincare and more opportunity to live the life you want."

It looks like Angelina is taking her cleansing and healthy lifestyle very seriously. Go girl! What do you think of her cleanse regimen? Sound off in the comments!