As well as coating your brows in warm castor oil each night (yes, really – it helps to stimulate hair growth), Sir John also suggests ditching eyebrow powders in favour of a pencil for any filling-in work.

Using feathery sideways sweeping movements, the beauty expert advises that you taper the strokes ever so slightly as you make your way towards the outer corner of your eye. You should try to stay light-handed with your product on the inner part of the brow (towards the face), in order to keep it looking natural.

And that’s not his only tip: speaking to Pop Sugar, Sir John revealed that using concealer around the eyebrows “in any way” is a very bad idea.

“There’s a misconception that in order to perfect brows, they need to be outlined with concealer, but you're only turning to concealer if you lack the confidence to draw on a perfect brow,” he said.

“Get rid of the training wheels and take the time to learn how to fill in brows.”

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