Kristin Cavallari and Jay Cutler

The Hills' Kristin Cavallari has given birth to a baby boy.

"We are thrilled to welcome Camden Jack Cutler into the world," Cavallari tweeted Wednesday. "Everyone is doing great!"

Kristin Cavallari expecting first child

Camden arrived Wednesday morning and tipped the scales at 7 pounds, 9 ounces. He is the first child for the reality star and her fiancé, Chicago Bears quarterback Jay Cutler.

Cavallari, 25, and Cutler, 29, started dating in the fall of 2010. They got engaged in April 2011, but split three months later. They reunited together shortly afterward and got re-engaged in November.