He's usually quiet when it comes to his personal life. But on Monday, 5 Seconds of Summer's Luke Hemmings surprised his 6.4 million Instagram followers by revealing that his girlfriend, Sierra Deaton, is bisexual. 5 Seconds of Summer's Luke Hemmings surprised his 6.4 million Instagram followers on Monday by revealing that his girlfriend, Sierra Deaton, is bisexual The Youngblood hitmaker, …
