The Girls Aloud singer was pictured rocking the throwback hairstyle on a photo shoot to promote the new Sainsbury's Sport Relief Headbands and also got kitted out in some pink leg warmers and a bright top with her surname branded across the front.
Commenting on why she had chosen to try out the mullet and pose as Olivia in the 'Physical' visual, Kimberley said: "Everyone loves this iconic still from the 'Physical' video, with Olivia Newton-John looking ultra-cool in her headband and workout gear.
"Amazingly the track was in the charts when I was born, 32 years ago, so it totally made sense to get involved in this revival shoot to launch this year's official Sport Relief Headband available from Sainsbury's, and to pay tribute to Olivia. I urge everyone to join in the fun by getting the gear and registering at sportrelief.com."
Pop star Kimberley is usually seen dressed in the latest trends with perfectly coiffed blonde hair, which rests on her shoulders. But we have to say, she doesn't look too bad with this new 'do - or in those leggings!
Earlier this week, the songstress transformed into another different character by taking on the role of a barmaid. Although it was just for the cameras.
In fact, Kimberley was pictured behind the bar of the famous Rovers Return from ITV's Coronation Street, while visiting the set and her actress friend Samia Ghadie.
However, we're still not sure if we'll be seeing a Girls Aloud cameo on Corrie later this year!
The official Sport Relief headband is available from Sainsbury's with a donation from each sale going directly to help transform the lives of some of the most poorest and most disadvantaged people in the UK and around the world.
What do you think of Kimberley's mullet? Let us know below, as the best comment from across the website each week wins £50!
Got an iPad or iPhone? Reveal Mag has been especially designed to fit!