The former actor was just 14 years old when she terrified a generation of filmgoers as a schoolgirl who spits obscenities and masturbates with a crucifix after being possessed by the Devil.

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The violence of her thrashing and jerking: Blair terrorises Max von Sydow in ‘The Exorcist’

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Not quite so spooky: Blair on the ‘Exorcist’ press tour in 1974

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Truly terrifying: Blair (centre) stars alongside Rachel Stevens, Jo O’Meara and Tina Barrett in the S Club 7 sitcom ‘LA 7’

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A second career: Blair, in 2015, posing with dog treats in her new role as an animal rights activist

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