Avril Lavigne calls herself the “Motherf*****’ Princess”. The 38-year-old ‘Complicated’ singer told the new issue of INLOVE magazine she uses the phrase as she considers herself a “boss”. Reflecting on her long career, she added: ‘I’ve always called myself the Mother F*****’ Princess because I am my own boss. “My view hasn’t really changed much, other than the fact that I started out as a 17-year-old, and I’m a woman now.” She added about the music business: “The industry has changed a lot. People buy fewer albums and stream more than ever. “Social media obviously plays a huge part in it, and …