Nicole Richie is "not ready" to have another child. The fashion designer hasn't ruled out having more kids with husband Joel Madden but says they are currently too busy with work and raising daughter Harlow, four, and son Sparrow, two.

"I'm not ready for baby number three - it's not something I'm discussing with Joel at the moment, but maybe we'll have another child sometime in the future. It's a full-time job taking care of two children but they mean everything to me. It's hard to balance being a full-time mum and having a career, but somehow you manage."

Nicole - who has previously battled drug addiction - believes becoming a mother helped her turn her life around: "Being a mum has changed me for the better - they're my number one priority. Nothing can prepare you for that kind of responsibility."

The 30-year-old star is currently preparing to take the children to Australia to join Joel, who is working as a coach on The Voice.

"Of course I really miss Joel when he's away filming The Voice because we like to be a proper family unit. I will take the kids to see him in Sydney because it's important for us to all be together."