
Worthington-Cox, 10, also made history by becoming the youngest ever winner of an Olivier. She described her triumph as "pretty cool".
The show also scooped Best New Musical and Best Actor in a Musical for Bertie Carvel.
Carvel praised his inexperienced co-stars, saying: "There is something beautifully unfinished about them and full of life.
"I'm proud of my part in it but frankly I'm proud of every inch of it, it's really witty, inventive, it's the kind of theatre I want to go and see which is the kind of theatre I want to be in," he added.
Best Director winner Matthew Warchus also paid tribute to his leading ladies.
"People often say to me 'Matthew, which is your favourite Matilda?' and as you saw earlier it's a ridiculous question, there are four little miracles there," he said via video-link from New York.
Other winners at the ceremony, held at the Royal Opera House in London's Covent Garden, included Best Actress Ruth Wilson and Jonny Lee Miller and Benedict Cumberbatch, who shared the Best Actor gong for their roles in "Frankenstein".
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The show also scooped Best New Musical and Best Actor in a Musical for Bertie Carvel.
Carvel praised his inexperienced co-stars, saying: "There is something beautifully unfinished about them and full of life.
"I'm proud of my part in it but frankly I'm proud of every inch of it, it's really witty, inventive, it's the kind of theatre I want to go and see which is the kind of theatre I want to be in," he added.
Best Director winner Matthew Warchus also paid tribute to his leading ladies.
"People often say to me 'Matthew, which is your favourite Matilda?' and as you saw earlier it's a ridiculous question, there are four little miracles there," he said via video-link from New York.
Other winners at the ceremony, held at the Royal Opera House in London's Covent Garden, included Best Actress Ruth Wilson and Jonny Lee Miller and Benedict Cumberbatch, who shared the Best Actor gong for their roles in "Frankenstein".
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