Sarah Harding is doing "really well".
Kimberley - who is currently playing Princess Fiona in the West End production of 'Shrek' - said: "I don't want to go into detail about Sarah, but she's doing really well. I hope that soon she will be well enough to come and see me. My contract's due to end in February."
She told new! magazine: "Cheryl and Nicola have seen it and they loved it. They texted me earlier to wish me good luck. Nadine will hopefully come and see me, too."
The 29-year-old beauty also revealed the group - who are currently on a break - are keen to work together again and would love to be the subject of their own musical.
She said: "A musical about Girls Aloud would be brilliant! It would work because it would have songs that are relatable. The girls and I have something planned for next year."