Kristin Cavallari Works Up A Sweat With Her Burgeoning Baby Bump In The Gym!

No baby bump is getting in the way of Kristin Cavallari's fitness!

The 28-year-old is pregnant with her third child so she's not new to the game!

And just to prove it, Kristin posted a shot of her doing a weighted, raised lunge to Instagram on Tuesday.

[ Related: Kristin Reveals The Gender Of Baby Number Three! ]

Perfect form, girl! She captioned the pic:

"Some of my favorite pregnancy workout moves up on the app

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