The `Girls Aloud` singer - who has been dating Justin Scott for eight years -recently admitted to becoming "seriously broody" after her sister Sally announced her pregnancy and pals now claim she is hoping to have kids of her own soon.
A friend said: "Kimberly and Justin are following every step of Sally`s pregnancy and are absolutely loving stocking up on little outfits for when he or she arrives. She`s become incredibly broody."
Kimberley`s band is currently on hiatus with no immediate plans to reform and friends say the singer thinks now is the perfect time to have children.
The pal added to Heat magazine: "She`s always dreamt of starting a family and thinks this could be the ideal time as it`s becoming clear that the group won`t be reuniting any time soon.
"Cheryl Cole is focusing on her `X Factor` judging duties and solo career. Plus, the four girls are barely in contact with Nadine Coyle.
"She turns 30 next year and she always planned on being married and having kids by then.