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Published 10:10 9 Nov 2014 GMT
Updated 10:23 15 Jun 2015 BST

There are so many of them I thought anyone could have a go. Really hope the boys keep me on #LeeNelsonForStereoKicks https://t.co/cM9JeLzprk
— Lee Nelson (@RealLeeNelson) November 8, 2014
Walsh joked that "everyone wants to be in this band now", as Mel B later revealed that Cheryl initially thought the stage invader was Take That star Mark Owen.
We don’t know about you but that ninth member could be the lads' lucky charm…
Standing ovation from all four judges for Stereo Kicks... The 9th member definitely has the #XFactor
— Her.ie (@Herdotie) November 8, 2014
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