Kristin Cavallari and Jay Cutler welcome son Jaxon Wyatt

Kristin Cavallari and NFL quartertback Jay Cutler attend the Opening Night Of Cirque du Soleil's "OVO" at the Santa Monica Pier on Jan. 20, 2012 in Santa Monica, Calif.
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Kristin Cavallari has become a mom for the second time - just in time for Mother's Day.

The reality TV star-turned-designer and Jay Cutler welcomed a son on Wednesday, she announced via Instagram.

"Welcome Jaxon Wyatt Cutler 7lbs 11oz 5/7/14," she wrote, sharing a photo of a little hat, booties and her hospital bracelet.

Cavallari, 27, and her Chicago Bears quarterback husband, 31, are already parents to 21-month-old son Camden Jack.

The couple announced in October that they were expecting, and revealed in February that Camden would be getting a baby brother.

Back in November, Cavallari told CBS News her husband has been "incredibly hands-on" as a dad. "He goofs around with Cam and he gets on the floor and plays with him. It's really cute to see."