Alexandra Tamposi (born November 17, 1989) is an American songwriter from West Palm Beach, Florida. She is best known for co-writing Kelly Clarkson's song "Stronger (What Doesn't Kill You)," 5 Seconds of Summer's song "Youngblood", DJ Snake's "Let Me Love You" featuring Justin Bieber, Camila Cabello’s "Havana" featuring Young Thug, and Cabello's "Señorita" with Shawn Mendes. She was featured on the Cedric Gervais single "Love Again". She is the granddaughter of real estate developer Samuel A. Tamposi.