Wearing little more than a slick of make-up, Sarah Harding, Nadine Coyle, Kimberly Walsh and Nicola Roberts looked less like a glamorous girl-group and more like normal young women in their twenties.
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Sarah Harding avoided doing her hair and make-up but her manicure was still in tact
The usually glossy Nadine Coyle left the studio with natural hair and just a slick of lipstick
However, just in case anyone didn't recognise them they were each sporting the celebrity accessory du jour - oversized sunglasses.
The four have obviously been working hard at the South-East London rehearsal venue ahead of their 22-date tour, which kicks off in May.
Intended to showcase their current album Tangled Up, it is sure to be a glitzy affair.
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Wearing oversized sunglasses, Nicola Roberts and Kimberley Wallace maintained celebrity glamour
Dressing down: Sarah kept it casual in an oversized tee, leggings and Ugg boots and
They entertained around 150 guests alongside fellow stars Westlife in a huge marquee at Kenwick Park Hotel in Louth, Lincolnshire.
Both groups played grteatest hits sets with the Irish boyband leading a Happy Birthday chorus to the teenager.
She is said to be the same schoolgirl who Pop Idol winner Will Young sang for on her 16th birthday.
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