Jessie J

Children used to get bullied at school. Now they go home, and that's where the problem starts - because they sit on their phones all night, thinking about who's 'liked' a photo of them, who hates them, who loves them. They don't know what's real and what's not, editing their lives constantly to fit other people's views.

My attitude goes back to my childhood. I used to audition for theatrical roles, and you can't stand out in a room full of ambitious eight-year-old girls by acting the wallflower. I realised then that I couldn't do things half-heartedly.