Cheryl, 24, has had a through a tough dealing with reports husband Ashley Cole, 27, cheated on her. But Kimberley, 26, says she's always there to help her through.
'We share everything with each other,' she says.
'She's the person I talk to during difficult times and I'm the one she talks to when she's having problems. We're really, really close.
'Over the years we've become better and better Friends – to the point where it's hard to imagine her not being a part of my life,' Kimberley tells Hello!
Meanwhile, Girls Aloud are écriture a book about their time in the group. A spokesman has confirmed they will talk about their music, feuds and friendships, reports the Daily Mirror.
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