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Semi-Finals all week at 8pm!

Preview: Ant and Dec play Big Star Little Star

Stephen Mulhern, star of stage and screen, recruits the help of Ant’s sister Sarah to find out what was the most stupidest thing he did as a child.

WARNING: This clip does include a snap of a young Anthony Mcpartlin!

Logo of Britain's Got Talent
itv |

Semi-Finals all week at 8pm!