Kristin Cavallari is pregnant with her first child.

The reality TV star and her NFL player fiance Jay Cutler have announced they are expecting their first child together, just four months after rekindling their relationship.

Former 'Hills ' star Kristin said: "We are thrilled to announce we are expecting our first child together. It's an amazing time in our life and we can't wait to meet the new addition to our growing family."

After getting back together, Kristin, 25, revealed she had always loved Jay, even when they went through their brief split.

She told People magazine: "Sometimes, in order for things to get better, they have to end - even if it's momentarily. And that was the case with us."

"No one really knows what happened between the two of us, and we want to keep it that way. We broke up, and we were still talking during that whole time."

"We didn't break up because of love lost. We loved each other just as much as we always did when we weren't together."