Brittany Marie Amaradio,known professionally as Delacey, is an American singer and songwriter. She has co-written songs such as "New York City" for The Chainsmokers, "Ruin the Friendship" for Demi Lovato, "Without Me" for Halsey (which reached number one on the Billboard Hot 100), "Dead for Madison Beer, and "Ruin My Life" for Zara Larsson.
