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When they were famous

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The third actor to play Rusty Griswold in 'National Lampoon's Christmas Vacation', Johnny Galecki now plays experimental physicist Leonard Hofstadter on the hit comedy 'The Big Bang Theory'.

The third actor to play Rusty Griswold in 'National Lampoon's Christmas Vacation', Johnny Galecki now plays experimental physicist Leonard Hofstadter on the hit comedy 'The Big Bang Theory'. Photo: YouTube/Domino Postiglione

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