United Kingdom, Jan. 30 -- Whitney Port feels "incomplete" as a mother-of-one.

The Hills star, 40, and her husband Tim Rosenman are parents to eight-year-old son Sonny but they have spent years trying to expand their family to give him a sibling and Whitney has now confessed she can't give up her dream of having another child because she feels "insecure" about her role as a mother.

In an interview with Spread the Jelly, she explained: "I don't think motherhood looks like what I imagined. I never thought I'd be a mom to an only child.

"I always knew I wanted more than one. I didn't picture this, and that's been a little weird for me. My identity as a mom doesn't feel fully solidified yet because I feel incomplete. I really do.

"I'm try...