The Canadian pop stars teamed up on the track, which is set to feature on Mendes’ upcoming album ‘Wonder’, last week (20).
Performing live from Los Angeles’ Microsoft Theatre, the performance began with Bieber giving a rendition of his own singles ‘Lonely’ and ‘Holy’. After the latter, Mendes appeared with an acoustic guitar, launching into ‘Monster’ in front of a digital forest.
‘Monster’ is the second taste of ‘Wonder’, Mendes’ fourth album, which is due to arrive on December 4. Watch footage of the performance below now.
Meanwhile, Bieber recently covered Christmas staple ‘Rockin’ Around The Christmas Tree’ for Amazon. Speaking about his cover of the Brenda Lee classic, the star said: “‘Rockin’ Around the Christmas Tree’ has always been one of my favourite songs to celebrate the holidays and I’m excited to team up with Amazon Music to share my own version, with my fans.”