Whole Again! Kerry Katona is the picture of health as she returns to the stage in Adelaide for Atomic Kitten reunion tour... after recovering from mystery illness

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She was forced to pull out the Atomic Kitten show in Perth on Tuesday when she was struck down with a mystery illness.

But Kerry Katona was back to her best the following evening, rejoining her fellow pop stars for a nostalgia filled concert in Adelaide despite battling with the after-effects of her ailment and back pain.

The 36-year-old star powered through her dance routines alongside fellow original member Natasha Hamilton and honorary Kitten Michelle Heaton.

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Back to her best! Kerry Katona was back to her best the following evening, rejoining her fellow pop stars for a nostalgia filled concert in Adelaide

Kerry appeared a little stiff in a video shared by close friend Michelle, but performed like a total pro.

She took to Twitter to update her fans on her progress, posting beautiful sunrise shots as she prepared to jet off to the next location. 

Atomic Kitten are touring Auckland, Adelaide, Melbourne, Brisbane, the Gold Coast and Sydney, performing their nostalgic pop classics alongside East 17, S Club and B*witched.

It is not known whether Kerry was forced to pull out of the show due to her ongoing back problems or another illness. 

Sharing her back pain woes with her fans, Kerry teased last week month: 'Having work done on my back really hoping it will be ok by the time I fly!'. 

On form: Kerry appeared a little stiff in a video shared by close friend Michelle, but performed like a total pro

Girl power: The 36-year-old star powered through her dance routines alongside fellow original member Natasha Hamilton and honorary Kitten Michelle Heaton

The lovable blonde later posted an in-flight selfie as the girls headed Down Under last week, alongside the caption, 'Smiling through the pain with my bad back!' 

The girls have been joined by Liberty X star and close friend Michelle Heaton for the trip, since third member Liz McClarnon is not participating. 

Liz previously revealed she wouldn't be joining the girls on tour because of her phobia of flying.

She said during an appearance on Lorraine last year: 'It's never been a favourite thing of mine, even all the way through the band, I've always gone, "Oh I hate this I hate this I hate this."

New line-up: The girls have been joined by Liberty X star and close friend Michelle Heaton for the trip, since third original member Liz McClarnon is not participating

Powering through: It is not known whether Kerry was forced to pull out of the show due to her ongoing back problems or another illness

'And when things ended [with the band], I was like, "I'm not gonna do it anymore". Do you know what? I just don't like it.' 

Earlier this week, Kerry apologised profusely for missing out and insisting she'd be back on the stage the next night. 

Taking to Twitter, the songstress praised her bandmates for going on without her as she revealed she was feeling 'poorly'.

She posted: 'Wow I hear the girls did a great job at the gig! Sooo gutted at how poorly I feel and i wasn't there to see you all!' 

The show must go on! Natasha and Michelle - who is filling in for Liz McClarnon on the tour - still performed for the crowds in Kerry's absence 

She now appears to be on the mend, however, as when asked by a fan if she would be back on the stage for Wednesday's show, she responded: 'I sure am my darling feeling a wee bit better xxx' 

Kerry added: 'To everybody in Perth I can't apologise enough for letting you down!! I'm so upset with myself as I've never missed a gig before! #sick.'

Sharing a sad selfie, she wrote: 'I am on the mend!!! But my god... really wasn't a pretty site last night! (sic)' .

Under the weather: Taking to Twitter, the 36-year-old songstress praised her bandmates for going on without her as she revealed she was feeling 'poorly'

Feeling better: Kerry now appears to be on the mend, however, as when asked by a fan if she would be back on the stage for Wednesday's show she insisted she would be

Apologies: She apologised to her fans for letting them down as she said she was so 'upset with herself' 

Feeling blue: Sharing a sad selfie, she wrote: 'I am on the mend!!! But my god... really wasn't a pretty site last night!'

Taking to Instagram after the show, Natasha shared a video of the pair performing which she captioned: 

'So....thrown in at the deep end tonight but me & Michelle loved tonight's gig in #Perth, the crowd welcomed us with open arms:) 

'thank u all so much for making such a memorable night x'

Born to perform: Natasha Hamilton shared a clip of herself on stage performing to the packed out stadium without her bandmate Kerry at her side 

Working the crowds: Natasha and Michelle still put on a killer show for the crowds 

Despite storming the stage, Michelle revealed that she too wasn't feeling 100 percent, as she shared a sad selfie from her bed on Tuesday. 

Taking to Twitter, she posted a picture of herself snuggled up in bed and sipping on a cold and flu remedy.

She wrote: '1.20am in Perth .. can't sleep .. up at 5am to fly to Adelaide.. have a bit of a sore throat & cold.. lemsip time..' 

The ladies' night appeared to be far tamer than the wild day they had on Thursday. 

Following a daytime drinking session on Auckland's Waiheke island, the trio were spotted in a cab, which was forced to pull over so Michelle could be sick on the street.  

Feeling feverish: Despite storming the stage, Michelle revealed that she too wasn't feeling 100 percent, as she shared a sad selfie from her bed on Tuesday

Overdone it: Their night was tamer than Thursday where after a daytime drinking session, the trio were spotted in a cab, which was forced to pull over so Michelle could be sick

Back on stage: The trio are touring alongside B*Witched, S Club 3, East 17 and Liberty X this month across Australia and New Zealand