Credit: Kido/FRIOLO/

Prenatal asanas!

Kristin Cavallari is keeping busy during her early stages of pregnancy. In addition to hitting Mexico last weekend with her fiance Jay Cutler, she's also working out!

"About to try yoga..I hear it helps with giving birth so sign me up! Whatever I can do to help that process!" Cavallari, who went makeup-less to the class, tweeted Friday.

The fresh-faced star's baby bump was visible through her loose-fitting, long-sleeved top, which she paired with black yoga pants and a white tank top.

Last week, the star showed off her new pregnancy curves in a strapless black one-piece bathing suit by Cia.Maritima.

"My stomach literally grew double overnight!" the Laguna Beach alum tweeted in February. "This belly came out of nowhere!"

This will be the first baby for Cavallari and Cutler, who have been dating off and on since 2010.