Kate Moss says she finds modelling "a bit brain damaging" and admits she still acts like a teenager.
The British beauty decided to design her own line for UK high street fashion chain Topshop to set herself a stimulating new challenge.
She said: "Modelling can be a bit brain damaging. Starting my own brand was what I needed to do. I only model if there are such good jobs that you don't want to say no to. All that dressing up makes me say, 'What do I want to wear?' and, 'What do I want to do with Topshop?' It all kind of leads into the other things."
The 34-year-old catwalk queen also admits she still behaves like a teenager, despite having a five-year-old daughter Lila Grace from a previous relationship with magazine publisher Jefferson Hack.
She said in an interview with America's Vogue magazine: "I am still acting like a seventeen-year-old. I definitely haven't become middle-aged. I've got a house and a daughter and all that, but I still like to have fun. Even in my business we still have fun."
However, the supermodel insists Lily always comes before anything else, adding: "I'm a mother. All the time. Every day. I put my daughter to bed."
Kate admits she enjoys being able to lead a luxurious life, but isn't motivated by fame and fortune.
She explained: "I like making money. But I don't call people up every day to see how much I've made. As long as I have what I need at the time. I mean, I can buy the house that I want."
