Lady Gaga (Stefani Joanne Angelina Germanotta)
Career: Lady Gaga started out as a songwriter for other artists until Akon signed her to his label. Her debut album, The Fame, topped the charts in six countries.
Relationships: Gaga has an on-off relationship with Luc Carl, manager of New York bar St Jerome. The couple split up before she found fame and many of the songs on The Fame are about him.
FYI: Gaga has tested borderline positive for the connective tissue disease lupus. Her aunt Joanne died of the disease aged 19.