The 29-year-old would like to settle down with Justin Scott, also 29, her boyfriend of eight years.
Walsh said: 'I'm definitely thinking marriage and babies. I always said I wanted loads of kids, but I’m 30 next year and wondering when I'm going to fit them all in.'
Kimberley, who is currently standing in for pregnant Amanda Holden in the London West End stage show Shrek The Musical, added to Fabulous magazine: 'I'm incredibly lucky to be financially secure and with the man I want to be with for the rest of my life.
'I've got no excuses, really, apart from that I need to get through this show and then we're talking about the Girls Aloud reunion next year...And then maybe I should get on with it.'