Jessie J

The pop star was bullied at school because she had to take medicine that made her skin appear green.

However, she later took revenge on her tormentors with the song ‘Who’s Laughing Now?’ on her debut album and hopes to help youngsters going through a similar experience.

The 'Price Tag' singer said: "I almost feel like I want to be a big sister to my fans that need one. I can put out music that I think will help them through some stuff."