Kristin Cavallari has not yet delivered her first baby but the pregnant reality star is already planning baby number two.

The 25-year-old is starting a family with fianc Jay Cutler, 28, and says they want a large family.

She told Glamoholic magazine that they don't want their children to be too far apart.

"We were talking about the possibility of having another kid right away and then getting married so we can have two kids close in age," she told the publication.

"We want four kids, so we're thinking maybe have one more, then get married, then have two more. But we'll see it all depends on how the first one goes."

The former Laguna Beach star says that she and the Chicago Bears quarterback "weren't trying to have a kid, but we weren't not trying."

"We left it up to fate," she revealed. "I knew there was a possibility but I was really excited! Even if you are trying, just to see a positive result is shocking!"

"It's so crazy to look at your life and see how far you've come. I always wanted kids but I always thought I would have kids later in my life, maybe when I turn 30.

"I really wanted to focus on my career, but you meet the right person and your whole world changes. You can't really plan these things."

Kristin added that Jay is "so excited" to become a dad.

"He's been wanting kids since I've known him, so he couldn't be happier," Kristen gushed.