What is Lady Gaga's real name?

Context: Stefani Joanne Angelina Germanotta, known professionally as Lady Gaga, is an American singer, songwriter and actress. She is known for her image reinventions and musical versatility. Gaga began performing as a teenager, singing at open mic nights and acting in school plays. She studied at Collaborative Arts Project 21, through the New York University Tisch School of the Arts, before dropping out to pursue a career in music. After Def Jam Recordings canceled her contract, she worked as a songwriter for Sony/ATV Music Publishing, where she signed a joint deal with Interscope Records and KonLive Distribution, in 2007. Gaga had her breakthrough the following year with her debut studio album, The Fame, and its chart-topping singles "Just Dance" and "Poker Face". The album was later reissued to include the extended play The Fame Monster, which yielded the successful singles "Bad Romance", "Telephone", and "Alejandro".

Answer: Lady Gaga is the professional name for Stefani Joanne Angelina Germanotta.