Twiggy believes her modelling career happened by accident.
The '60s fashion icon, whose real name is Lesley Lawson, doesn't think she would have made it in the nitty-gritty industry if she had attempted it now because there's too many young girls dreaming of becoming models nowadays.
Speaking to the Daily Mail's FEMAIL, she said: "I think it's tougher now because there's so many more girls that want to be models. You've got to remember what happened to me - I didn't plan it. I didn't dream I had a hope in hell of being a model. I was too small, too thin - if I'd have gone to an agency they wouldn't have taken me."
She added: "I think the reason what happened to me happened is because I didn't look like anybody else."
The 66-year-old supermodel says "amazing" Cara Delevingne, 23, is her favourite in the business at the moment because she's not afraid to express her true self.
She explained: "She's not just a model, she's a personality. She's very funny, beautiful and quirky.
"This is what I said to the contestants on 'Top Model', it's not good copying someone else, if you want to be as popular as me or as Kate [Moss], you need to be you."