I absolutely love Jessie J's - Who's Laughing Now. She is so open about being bullied when she was younger and releasing this song is so inspirational for all those who have suffered bullying in their past or present. Many other celebrities have been bullied when they were young; members of JLS, David Tennant, Kate Winslet, Sandra Bullock, Megan Fox, Tyra Banks.... But they have 'made it' and this song shows that even if you are bullied you can still carry on and be whoever and whatever you want to be. It has such a good message and meaning unlike some songs that you hear.
P.S. Jessie J's album Who You Are is definitely worth a listen. I actually really like it and this song is one of my favourites along with a few others.