London: Fashion designer Nicole Richie says she and husband Joel Madden are far too busy right now to add to their family.

The 30-year-old socialite hasn't ruled out having more kids but says she is busy raising daughter Harlow, four, and son Sparrow, two, as reported.

"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," Richie said.

The socialite, 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," she added.