Pregnant Kristin Cavallari spotted makeup-free, showing off baby bump in yoga clothes. Kristin Cavallari is keeping herself moving during her first trimester of pregnancy. In addition to vacationing Mexico last weekend 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.

“My stomach literally grew double overnight!” the Hills starlet 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.