Mum’s the word for Kimberley Walsh as the singer says what happened at Cheryl Cole’s Las Vegas 30th birthday bash will stay in Vegas.

Cole, Walsh, their Girls Aloud bandmate Nicola Roberts and Cole’s boyfriend Tre Holloway partied in the States last weekend to celebrate Cole’s landmark birthday, but Walsh won’t be divulging any details.

"We were in Vegas so it was always going to be wild," she told the Daily Star. "We had lots of fun but my lips are sealed."

Cole recently slammed a journalist who had remarked that the celebration had been a lacklustre affair and “depressing”.

 "Meow...Who exactly was my party depressing for? yourself? sitting behind your little computer watching Instagram.. aww!!” said Cheryl. “Well I really don't know where to start with this one I have to say! Cats got my tongue (no pun intended) I am actually dumbfounded reading your nasty bitter horrible incredibly inaccurate and misinformed article!”

Watch Kimberley Walsh’s video for ‘One Day I’ll Fly Away’ below: