Alesha Dixon admitted she knew one Britain's Got Talent act during the first batch of live auditions as the ITV series returned on Saturday.
Simon Cowell, Amanda Holden and new judge Bruno Tonioli were left stunned by the revelation with Alesha later revealing she knew the musician from her days in noughties girlband Miss-Teeq.
The admission came when community choir The Big Sing, made up of singers from ages 3 to 83, walked on stage.