And a baby makes four.

Kristin Cavallari and her Chicago Bears quarterback husband, Jay Cutler, 31, are expecting their second child, Cavallari confirmed on Twitter.

"Thank you for all the love!! We are so excited for Camden to be a big brother!" she wrote.

Cavallari and Cutler are already parents to one-year-old Camden. The couple have been open about their desire to expand the family.

"We want to have a second sooner rather than later," the 26-year-old told E! News at a Junk Food Vintage NFL event in New York.

The 26-year-old reality star turned designer said she wanted to become a mommy for the second time as soon as possible; revealing she started for a second child six months after giving birth to Camden, but she "wasn't ready."

"We're working on it!" Cavallari told People Magazine. "We know we want another one close in age to Camden and we're at the point where we're both ready. Before Camden was born, I thought I'd be pregnant again by the time he was six months, but I definitely wasn't ready. Now, I'm finally ready."

The reality star is hoping for a baby daughter the second time around.

"Obviously, I want a little girl, but if I had another boy I would be so excited as well," told People. "I love having a boy. Either way, I'd be really, really happy."

The couple recently celebrated a milestone with their June wedding in Nashville. Around 150 guests attended the ceremony actually the day after they quietly exchanged their vows at Woodmont Christian Church followed by a rustic reception at a big historic warehouse, with a live band and Southern comfort food.

The newlyweds then honeymooned in Italy, which "was awesome," Cavallari told E! News. "I ate and drank for two weeks straight. It was great."

Thank you for all the love!! We are so excited for Camden to be a big brother! https://t.co/xCVAGzKdgc

— Kristin Cavallari (@KristinCav) October 30, 2013