WebStefani Joanne Angelina Germanotta (/ ˈ s t ɛ f ən i ˌ dʒ ɜːr m ə ˈ n ɒ t ə / ⓘ STEF-ən-ee JUR-mə-NOT-ə; born March 28, 1986), known professionally as Lady Gaga, is an American singer-songwriter and actress. She is known for reinventing her image and showcasing versatility in entertainment.