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Emma Watson, who played Hermione Granger in the hit films, was one of the celebrities to back the charity.
JK Rowling challenged the presenter to sue her Mermaids trustee Dr Jacob Breslow spoke at an academic conference in Baltimore in 2011, which appeared to criticise societal understanding of paedophiles.
Ms Rowling responded to the presenter challenging her to start a petition, claiming she would be the first one to sign it.
Emma Watson is one celebrity that has previously vocalised her support for the charity
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