They're the sisters whose hairstyles are coveted the world over.
And the Kardashians' hairdresser Jonathan Colombini has spilled the secrets behind their varying looks, revealing Kylie likes her hair to be sporty and match her tracksuits while Kendall's locks must be different from other catwalk models.
Jonathan spoke to Daily Mail Australia as he begins a one month residence at La Boutique Salon in Sydney's Double Bay
The Los Angeles-based hairdresser also counts Khloe Kardashian, Paris Hilton, Laura Prepon and Nicole Scherzinger among his celebrity clients.
Jonathan began styling Kylie's hair after meeting on a photo shoot, where they 'just instantly got on'.
But the 35-year-old was stolen from Kylie by her older sister, who he now spends most of his time following around the world's catwalks.
Despite their fame, the hairdresser said the sisters remain extremely down to earth and are often unaware of how they appear to the public.
'There is sometimes when you are with them when I don't think they realise how famous they are,' he said.
And we don't realise sometimes while working with them until you go out and people recognise them and there is a line of paparazzi everywhere!'