Kristin Cavallari App: Former 'Hills' Star & Jay Cutler Are Expecting Third Child, She's Pregnant [VIDEO]

Kristin Cavallari will soon be a mother of three.

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On Monday, the Hills star turned shoe designer announced she and husband Jay Cutler were expecting their third child.

“We’re at it again! Thrilled to announce baby number 3 is on the way!” Cavallari wrote on her app, according to a report by MTV News. In the accompanying photo, Cavallari was seen in a blue shirt and short shorts, with her two sons, two-year-old Camden and one-year-old Jax, sitting behind her in a wagon. “The Cutler crew just keeps on growin’!”

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In an interview with Us Weekly over the weekend, Cavallari spoke of her two sons, and revealed the possibility of having a third child with Cutler.

"It flies by so quickly," Cavallari explained of the boys' childhood. "It kind of makes me sad. But they’re both at such fun ages now. They're able to start playing together a little bit now that Jax is 1. It's really nice. I feel like we’re in a really good place. They're both great kids."

That isn't to say, however, that the two boys don't butt heads on occassion.

"[Camden] is very protective and very sweet, But he also gets a little upset when Jax tries to take his toys and messes with his stuff," Cavallari said. "He gets a little territorial with some stuff, so it's kind of funny."

Then, oddly enough, Cavallari told the magazine she and Cutler hoped to add a third child to their growing family, but said, "Right now our hands are full."