02/15/2014 02:13 pm ET Updated Feb 15, 2014

Kristin Cavallari Is Positively Glowing In Latest Selfie

Expectant mother Kristin Cavallari took to Instagram to post a photo of herself in a tight white tank top and workout pants. "Baby bump getting BIG," she wrote.

Her little boy, Camden, born in August 2012, can be seen in the background of the pic.

Cavallari announced her second pregnancy in October. Earlier this month, she revealed she is having another baby boy. She has been maintaining a healthy routine since finding out she is expecting.

"I do Pilates usually twice a week, and then I do the Stairmaster for like 15 minutes, followed by light weights, but I've been taking it a little bit easy," she told Us Weekly in November. "The only difference is now I'm tired, but I still have to be a mom to Camden and run around and chase him around so that part makes it a little bit more difficult, but, I mean, it's not that bad."