Kristin Cavallari happily expecting baby No. 3

The Cavallari-Cutler household is expanding.

The Hills reality star Kristin Cavallari, 28, announced on her new app Monday that she and NFL hubby Jay Cutler are expecting.

"We're at it again!" she wrote. "Thrilled to announce baby no. 3 is on the way! The cutler crew just keeps on growin!"

The new addition to the family will join sons Camden Jack, 2, and Jaxon Wyatt, 1.

Cavallari said at one point she wanted four kids, but in August she seemed to have downsized that idea, telling Michigan Avenue magazine, "Before we had children, Jay and I both wanted four, and now we're thinking three, but we're just going to have to see how it goes."