By LUCY BUCKLAND and DONNA MCCONNELL
Looking good! Cheryl powered through the show in style - if she hadn't mentioned her illness then audiences would be none the wiser
There has been a lot of pressure on Girls Aloud - a massive reunion tour with dates across the country and an album to promote.
So perhaps when Cheryl Cole announced backstage she wasn't feeling too well, the rest of the members began to panic.
But in typical Cole style, the feisty brunette powered through the group's final night at the O2 - with a little help from a Madonna-style vitamin shot and by the online the reaction the girls more than impressed their loyal fan base.
Powering through: Sources at the concert told MailOnline Cheryl was ill prior to the show - but she powered through the concert with style
The five girls, who are touring the country as part of their Ten reunion, took to stage at London's O2 on Saturday evening looking as fierce as ever - with sizzling costumes which showed off their amazing figures and an array of their greatest hits.
Although sources at the concert told MailOnline Cheryl, 29, was fighting off an infection and despite getting a huge uplift from the crowd the brunette had taken an energy jab to get her through the gruelling show.
Fierce! Cheryl and Nicola show off their curves in the revealing costumes to the delight of the crowds at the O2
He looks pretty happy with himself! One of Girls Aloud's backing dancers looks pretty pleased with himself that he landed this job
Cheryl, who has been linked to the vitamin injections before, certainly pulled off an energetic performance with onlookers saying they couldn't believe she was ill.
It is thought Cheryl took a B12 injection, which is similar to taking a vitamin tablet - but much more potent.
'Alcohol and stress deplete the body of vitamin B12,' Dr Martin Kinsella, who offers the jabs at his Cheshire clinic told MailOnline.
'If you don't have enough, you can feel low, rundown and lethargic. A quick shot of B12 can change that.'
She made a Promise to be there... and she was! Cheryl grins to crowds with Nadine, Kimberley and Sarah
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