Later this month, Kimberley is set to marry her fiancé Justin Scott and while Cheryl Fernandez-Versini and Nicola Roberts are set to be bridesmaids, rumour has it Sarah and Nadine have been left off the guestlist.
According to The Sun, Kimberley has chosen not to invite her former bandmates, as she is planning to keep her nuptials to close friends and family.
A source told the paper: "It isn't personal on Kimberley's part, it's not going to be a big wedding. She just wants very close friends and family."
"[Kimberley] sees Sarah more as a former colleague than a close friend, but she has no problem with her," they added. "She wouldn't want this to cause any issue between them, but Sarah won't let this make her bitter."
"[Sarah is] excited Kimberley's getting married and wishes them both well," they said. "Unlike Nadine, she always thought her relationship with the rest of the band was good."
However, the guestlist for Kimberley's big day is still yet to be confirmed.
Reports Sarah and Nadine won't be joining Kimberley at her wedding come after news Cheryl has played a 'huge part' in her best friend's wedding plans.
As well as her bridesmaid duties, Cheryl is thought to have turned wedding planner and will make sure everything runs smoothly when Kimberley ties the knot in Barbados in a few weeks time.
On Saturday night (16 January), she joined Kimberley for her 'wild themed' hen do in London. The girls headed out in Mayfair with Nicola Roberts, Denise Van Outen and Kara Tointon in tow.
For exclusive competitions and amazing prizes visit Reveal's Facebook page NOW!