5. Jessie J.
Now she’s a well known pop star, then she was Blousey Brown in a stage school production of Bugsy Malone.
16. Rochelle Humes, The Saturdays.
Before The Saturdays existed Rochelle Humes was in S Club 8, otherwise known as S Club Juniors.
17. Frankie Sandford, The Saturdays.
As was her bandmate Frankie Sandford. They’ve known each other a long time!
24. Kimberley Walsh, Girls Aloud.
She’s the epitome of style and grace now, but as a child Kimberley appeared in a toilet roll advert while sitting on the loo. Nice.