Stefani Joanne Angelina Germanotta (born March 28, 1986), known professionally as Lady Gaga, is an American singer, songwriter, and actress. An influential figure in popular music, she is known for her image reinventions, flamboyant fashion, and versatility across the entertainment industry. With estimated sales of 124 million records, she is one of the best-selling music artists of all time.

After signing with Interscope Records in 2007, Gaga achieved global recognition with her debut album, The Fame, and its reissue, The Fame Monster. The project yielded a string of successful singles, including "Just Dance", "Poker Face", and "Bad Romance", which made her one of the few artists with at least three Diamond-certified songs in the US. Her second studio album, Born This Way, explored electronic rock and techno-pop and sold 1.1 million copies in the US in its first week. Her business ventures include the non-profit Born This Way Foundation, which supports the wellness of young people.