The Chainsmokers, Lana Del Rey, Little Mix and more also played at the UK fest this weekend.
'The minute I wrote this song I knew I wanted to get it out,' Mendes said of his latest.
Watch performances from Bruno Mars, Katy Perry, Ed Sheeran, Shawn Mendes and more.
From Zayn Malik to Justin Bieber to Taylor Swift, these celebrities dish on what it was like experiencing their first kiss.
If this week's Billboard Hot 100 chart is any clear indication of forthcoming musical trends, it looks like guitar-driven pop may be in vogue for 2017.
Shawn Mendes supports his 'I Know What You Did Last Summer' collaborator Camila Cabello amid her dramatic departure from Fifth Harmony.
Cabello's already collaborated with Shawn Mendes and Machine Gun Kelly — is her solo star about to rise?
Musical guest Shawn Mendes performs on 'Saturday Night Live' on December 3. Watch clips of his set.
From Fifth Harmony to Justin Bieber to Sting, there was no shortage of superstar performances at the 2016 AMAs. Which one was the best?
Shawn Mendes treated the AMAs audience to a performance of his singles 'Treat You Better' and 'Mercy.'