NEW YORK (AP) - Kristin Cavallari is pregnant with her second child. And she tweets that it's going to be a boy. That's also good news for her hubby, Chicago Bears quarterback Jay Cutler, who is currently sidelined with a groin injury. Cavallari says she and Cutler are "so excited" that their 14-month-old son Camden will be a big brother. Cavallari and Cutler were married last June in Nashville, Tenn.