When one of Hollywood’s hottest hairstylists tells you that you’ve been shampooing your hair all wrong - it’s time to listen up.

Jen Atkin of the Ouai haircare brand, who works on the Kardashian-Jenners, Bella Hadid, and Chrissy Teigen, revealed the hack at a recent event in the UK.

The 38-year-old recommends using two shampoos instead of one whenever you wash your hair, particularly if you have long, colour-treated hair.

The effects of colouring mean your strands vary in condition from root to tip, so Atkin advises using a volumising shampoo on your scalp and a moisturising shampoo at the ends.

The  effect is even more pronounced if you have balayage or ombre colour, according to the hair guru. 

Since brunettes and blondes have very different hair needs, if your locks go from dark to light they’ll have different requirements too.

So now you know how to target your tresses to achieve the perfect balance.