Despite the noughties band entertaining the nation with their medley of S Club 7's greatest hits, Jo has said she felt her vocals on the night were "not her best".
Speaking to the Metro after receiving some criticism about her performance, Jo agreed her singing may not have been on point - but, not without hitting back at her critics too.
"We didn't mime and it was brave to sing live," Jo said, "It wasn't my best, but I'm glad I did it."
She added: "It was just that it was the first time in all those years. [Children In Need] is a big show to make a comeback on - in front of millions of people singing live."
Despite what Jo may think, the band's fans absolutely loved her performance and sent Twitter into meltdown following S Club 7's Children In Need comeback.
Performing for the first time in 12 years, S Club 7 treated viewers to a selection of their classics including 'Don't Stop Moving', 'S Club Party' and 'Reach'.
And, as they took to the stage, fans - including a few famous faces - were quick to share their excitement at S Club reuniting.
While Celebrity Big Brother's Rylan Clark couldn't resist tweeting the lyrics to 'Bring It All Back', McFly's drummer Harry Judd said: "Don't stop movin' to the S club beat" #sclub7. I won't Rachel (Izzy says I'm allowed to still fancy her, win)."
Since their musical return last Friday (14 November), S Club have now announced they will be going on tour in 2015.
Heading up and down the country in May next year, the band will perform across 11 dates.
Best news ever, right?
Announcing their tour via Twitter, S Club 7 tweeted: "Some very exciting news guys! We are bringing it all back for a tour in 2015 #bringitallback2015 #sclub7 #SCLUBPARTY."
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