Stefani Joanne Angelina Germanotta, known professionally as Lady Gaga, is an American singer-songwriter and actress. She is known for reinventing her image and showcasing versatility in entertainment. Gaga started performing as a teenager by singing at open mic nights and acting in school plays. She studied at Collaborative Arts Project 21 before leaving to pursue a music career. After a contract cancellation by Def Jam Recordings, Gaga worked as a songwriter for Sony/ATV Music Publishing. In 2007, she signed with Interscope Records and KonLive Distribution. Her breakthrough came the following year with her debut studio album, The Fame, and its number-one singles “Just Dance” and “Poker Face”. The album was later reissued along with The Fame Monster (2009), which yielded the successful singles “Bad Romance”, “Telephone” and “Alejandro”.