Take a look back at these Hollywood icons in their early days to see how far they've come in their careers—and how little they've visibly aged.
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Cast
| Episode credited cast: | |||
| Samantha Barks | ... | Self - Potential Nancy | |
| John Barrowman | ... | Self - Judge | |
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Daniel Boys | ... | Self - Performer |
| Jessie Buckley | ... | Self - Potential Nancy | |
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Arthur Byrne | ... | Self - Potential Oliver |
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Alexander Hockaday | ... | Potential Oliver |
| Barry Humphries | ... | Self - Judge | |
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Ben James-Ellis | ... | Self - Performer |
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Jordan Li-Smith | ... | Potential Oliver |
| Andrew Lloyd Webber | ... | Self - Chief Judge (as Lord Andrew Lloyd Webber) | |
| Graham Norton | ... | Self - Presenter | |
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Jodie Prenger | ... | Self - Potential Nancy |
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Karl Schmid | ... | Self |
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Harry Stott | ... | Self - Potential Oliver |
| Denise Van Outen | ... | Self - Judge | |
