Cheryl joined Denise Van Outen to toast the success of Kimberley's book, A Whole Lot Of History, held at Hotel ME in London.
And Cheryl paid homage to her large rose tattoo which covers her lower back and bottom, by wearing a red lace dress with a rose design! She teamed her chic frock with tan heeled sandals and styled her hair in a bun.
No doubt the 30-year-old stayed close by Kimberley's side for most of the night, but she also slipped away to cuddle up to the next big thing - a blown-up poster of Kimberley!
While Cheryl opted for the 'lady in red' look, Kimberley wowed in a plunging midnight blue jumpsuit. Keeping her blonde hair straight and sleek, Kimberley completed her look with red pointed heels.
Denise looked equally stunning in a black and pink shift dress, and clutched Kimberley's new book as she left the venue. Taking to Twitter after the event, she said: "So nice to catch up with these two lovely ladies last night. Proper little gems."
She added: 'Huge congrats @KimberleyJWalsh can't wait to read your autobiography 'A whole lot of history' xxx #proudmate."
One person who couldn't make the celebration was Kimberley and Cheryl's former bandmate Nicola Roberts, who tweeted: "@KimberleyJWalsh Miss Walsh, I hope you're having a lovely time at your book launch tonight. Love u xx."
Kimberley's book is an honest account of life in the band and reveals the relationships she had with her band mates. In an excerpt from the book, Kimberley revealed that she wouldn't be friends with Nadine Coyle and Sarah Harding if it wasn't for Girls Aloud.
Kimberley later defended her comments, explaining that everyone who is mentioned in the book received a copy out of courtesy.