Justin Drew Tranter (born June 16, 1980) is an American songwriter, singer, and activist. Frequently co-writing with Julia Michaels, Tranter has written songs for artists such as Britney Spears, Gwen Stefani, Linkin Park, Kelly Clarkson, Sara Bareilles, Selena Gomez, Justin Bieber, DNCE, Citizen Queen, Kesha, Imagine Dragons, The Knocks, Fifth Harmony, 5 Seconds of Summer, Chappell Roan, Ariana Grande, Lady Gaga, Raye, Bea Miller, Demi Lovato, Dua Lipa, Måneskin, and Fall Out Boy. From 2004 to 2014, Tranter was the lead singer of Semi Precious…