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Published 21:30 2 May 2015 BST
Updated 13:28 11 Jun 2015 BST

It must have worked, because the foursome got the thumbs up from Simon Cowell, David Walliams, Aleesha Dixon and Amanda Holden.
“This could be either a really good idea or you are the most annoying girl group in history. I imagine everywhere you walk, birds are going to be smiling, it is always sunny, it is always happy. I think your target audience is three year olds… and Amanda,” said Cowell.
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