United Kingdom, Feb. 19 -- Hailey Bieber is "a lot more relaxed" as a mother than she thought she would be - and she wants another child.

The 29-year-old model has 16-month-old son Jack with her pop star husband Justin Bieber, 31, and she is keen to add to their brood.

Speaking on Jake Shane's Therapuss podcast, she said: "I definitely do want one more.

"I'm not in a rush, but I definitely want one more. Maybe I'll have four more. Maybe I'll have three. I don't know, I really don't know. I'm just taking it one day at a time."

Hailey has had "so much fun" since being a mom.

She said: "It is so fun. I always knew I wanted kids, I always wanted to be a mom.

"And then when it happens, you never know what to expect and you don't know wha...