On “Monster”, the latest single from Shawn Mendes’ forthcoming album Wonder, the singer-songwriter taps Justin Bieber for a duet about the dark side of celebrity. “I called him up and I was like, ‘Look, I have this song, it kind of goes there,’” Mendes tells Apple Music. “It's about how society puts celebrities up on a pedestal and watches them fall, and it seems to be entertainment. His heart fell deep into it. And it was a full-circle moment for me. This guy was the reason I started singing. So for our truths to come into [‘Monster’], it feels like one of the most special songs I've ever written.” Listen to the moody, confessional collaboration and pre-add the album now. Once it’s released, the entire thing will be available in your library instantly.