We know how close all of Girls Aloud are, so it must be pretty daunting for them to get on stage and go it alone.
Last night Kimberley Walsh gave her first solo performance at the NTAs, and it seemed to split opinion.
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Kimberley Walsh looked absolutely stunning as she performed One Day I'll Fly Away at the NTAs in a shimmering floor-length gown.
However, once she finished up her performance, some meanies took to Twitter to slate it.
One user commented: "It was Kimberley Walsh's first live performance... I recommend it be her last."
Even the celebs got involved, with glamour model Nicola McLean saying: "Omg I'm a fan of Kimberly but she sounds like a dying cat #NTAs."
After all, Girls Aloud have been in tour rehearsals for a few weeks now, so going solo was probably a pretty daunting prospect for Kimberley.
However, it wasn't all doom and gloom. Kimberley Walsh's participation on this year's Strictly Come Dancing saw the show win the NTA for Best Talent Show.