When Queen B steps on stage or goes before the flashbulbs, her flawless maquillage is the work of Sir John, a celebrity make-up artist who believes that less is more and speaks of 'looking into his clients' souls'. He bares his to Harriet Walker.

Jesus had the Turin Shroud, Beyoncé has the white towel. There is no more honest testament to the staying power of her face – or of the creative talents of the man who makes it up, Sir John Barnett.

Proof comes in Netflix's recently released Homecoming, a two-hour rockumentary filmed around the singer's Coachella shows last

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I tested Sir John's make-up: Here's my verdict