'I knew fashion was going to be part of my job, so I thought I might as well have fun with it.
I didn’t want people to decide what I was going to wear and what I was going to look like and how I should behave.
'Clémence has a wonderful containment, which really suits Isabelle’s character,’ she says.
'She’s a very sophisticated actress for someone so young.’ That’s a quality that works for Poésy behind the scenes, too.
He’s a very easy man to talk to.’ When I ask her about men in her private life, though, she politely replies: 'Oh, I never talk about that.
'That kind of passion can all of a sudden make you feel as if you’ve had no idea who you were for a very long time.Do you think I’m allowed to talk about our clever technique for the sex scene? She’s dressed down in black – jeans, sloppy jumper – but she still looks effortlessly cool.At last autumn’s Chanel catwalk show in the French capital she was a front-row paparazzi magnet. As well as being a fashion pin-up, Poésy is a musician (she plays guitar and sang on last year’s debut album by the Arctic Monkeys associate Miles Kane) and keen artist (she has illustrated her own children’s story).'Because that can happen really quickly in fashion if you don’t show that you know your stuff.'I knew a bit about what Coco Chanel had done for women,’ she continues. 'And, with Nicolas, I’d seen his work from the beginning in magazines, so I knew what I was getting myself into.