Kristin Cavallari finds it a "little scary" being a new mother.

The reality TV star and her fiance Jay Cutler welcomed their son Camden into the world last month. Kristin has revealed how her life has changed since her new family addition arrived.

"I like having this life that I'm responsible for," she explained in an interview with People. "It's exciting and so rewarding, but it's also a little scary!

"It was the most incredible moment I've ever felt. With Camden, I've realised what really matters. We're a family."

Kristen has revealed what partner Jay noticed about their baby son when he first set eyes on him. The sports star - who is the quarterback for Chicago Bears - was instantly impressed by the size of his hands and feet.

"He pointed out right away how big his feet are! And his hands were massive he'll sure be able to hold a football," she giggled.