January 11, 2012 08:00 AM

Albert Michael/Startraks

Tori Spelling and Dean McDermott are suffering from a bad case of baby fever.

Only three months after welcoming their third child together — daughter Hattie Margaret — the couple already see a fourth baby in their future.

“We think we might want a fourth … we’ll see. If it’s in the stars, if it’s meant for us to have another one, we will,” Spelling, 38, tells PEOPLE.

While she insists the proud parents are already “lucky” with their family of five, McDermott quips, “I think the baby store is open for another one.”

In the meantime, however, Spelling and McDermott are settling into an easy routine with Hattie and her siblings, Liam Aaron, 4½, and Stella Doreen, 3½.

“Three children, four and under,” says the actress. “That’s the part I like to say because that’s a big feat, I think.”

But while it may sound daunting, McDermott reveals raising their growing brood has been anything but difficult.

“Oddly enough, having three children under five [has] been easy,” he says. “A lot of people ask if we’ve lost our minds and if it’s so difficult. Actually, it’s great.”

So what’s the secret to their success? The age spans between the three children.

“Liam and Stella are at the age where they’re best friends and they hang out together. And Hattie stays where you put her, so for right now, everything is really easy,” McDermott, 45, explains.

“The transition has been amazing. They take care of her and they always check in on her and want to help do stuff,” Spelling adds.

“They’re at that age where you can send them to do something like, ‘Go get this, go get that for Hattie,’ and they’ll do it.”

— Anya Leon

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