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Justin Drew Tranter is an American musician, songwriter and activist. He has written songs for Britney Spears, Gwen Stefani, Linkin Park, Kelly Clarkson, Selena Gomez, Justin Bieber, DNCE, Kesha, In Real Life, Fifth Harmony, 5 Seconds of Summer, Ariana Grande and Fall Out Boy, and frequently co-writes with fellow American songwriter Julia Michaels.