Lady Gaga is a singer.
Stefani Joanne Angelina Germanotta ( [ ˈstɛfəniː_dʒɜrməˈnɒtə ] ; born March 28 , 1986 ) , known professionally as Lady Gaga , is an American singer , songwriter , and actress . A follow-up EP , The Fame Monster ( 2009 ) , was met with a similar reception and the singles `` Bad Romance '' , `` Telephone '' , and `` Alejandro '' were also successful . With her fifth studio album Joanne ( 2016 ) , she became the first woman to have four US number one albums in the 2010s .