Days after the 24-year-old star of Laguna Beach and The Hills announced her pregnancy, Cavallari's costar Stephanie Pratt shared her joy with Us Weekly.
"I am so excited for Kristin!" Pratt, 25, told Us. "They are going to be such a cute and fun family!"
Cavallari and Chicago Bears quarterback Cutler, 28, met in August 2010 through mutual friend Giuliana Rancic. After just eight months of dating, Cutler asked Cavallari to be his wife. They called off their engagement in July 2011 but got back together in November when Cavallari was competing on Dancing With the Stars.
Cavallari will be the first star from The Hills to have a child: Heidi Montag, now 25, famously had a pregnancy scare during Season 2 of the MTV hit in 2007.