September 29, 2012 12:00 PM

Jonathan Clay Harris

It was certainly a bit of a “surprise” when former reality star Kristin Cavallari first learned she was pregnant.

“I was shocked but really excited; we were both really excited,” the new mom, who welcomed son Camden Jack on Aug. 8, tells PEOPLE exclusively.

But it certainly hasn’t taken the starlet and fiancé Jay Cutler long to settle into their new roles as parents. “We’re a family and it feels like we’re already married,” she admits, adding “marriage isn’t at the top of our priority list right now, but we’ll do it.”

One thing that is on their minds? More babies!

“We’re talking about having another baby soon,” she says. “We want kids close in age. Jay wants four so we’d love to have two closer in age, take a little break then have two more.”

As far as their timeline, Cavallari reveals, “I can see us having another baby in a year. We’d love to have three boys and a girl. But we’ll be happy with anything!”

With Cavallari, 25, continuing to further her acting and fashion career — she’s currently designing shoes with Chinese Laundry — and Cutler, 29, thriving as quarterback for the Chicago Bears, the couple is determined to keep their kids grounded.

“There’s a quote from Warren Buffett, ‘I want to give my kids enough so that they could feel that they could do anything, but not so much that they could do nothing.’ That’s our motto,” Cavallari explains.

One thing is for sure, those kids won’t be getting away with much when moms around. “I think I’ll be the strict parent. I know what I was like,” says Cavallari with a laugh. “But I can see Jay being the cool dad.”

For now it’s all about Camden (and the current football season!), but Cavallari and Cutler have the off-season — and their future — already planned out.

“We have a house in Nashville and when Jay is done with football, that’s where we’ll live and raise our family. It’s beautiful,” shares Cavallari.

— Jennifer Garcia

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