The 38-year-old supermodel says she`s always been into fashion and as she didn`t have a sister, she used to put her sibling Nick in her clothes and call him Sylvia.
She said: "I definitely liked clothes. I used to dress my brother up in looks, as girls. His name was Sylvia. I used to dress him up and make him come to the door and knock and say, `Is Kate coming out?` to my mum. I`ve got a picture of him. He had a beauty spot, fake boobs, and everything - very Liz Taylor. My brother didn`t mind. He found the picture and framed it for me. `Kate, Love always, Sylvia.` "
While Kate - who has 10-year-old daughter Lila Grace from a previous relationship and is married to Jamie Hince - enjoyed her childhood she says she always knew she wanted to get out of hometown Croydon, south London.
She told Vanity Fair magazine: "My brother still lives near there and he doesn`t really go to pubs there, it`s so rough. But it was quite fun growing up there because it is so rough. There`s street stuff going on.
Everyone used to hang out in parks and have fights and go to the cinema and have fights. Bit of fight culture in Croydon. I don`t mind a fight. What I wanted to get out of was the whole thing of, this is it. This is what life is. I never had that feeling of, that`s your lot."