Mendes performed "There's Nothing Holdin' Me Back", the victor of "Best Song".
Stormzy's triumphant performance at the MTV EMAs last night was nearly derailed when he found himself trapped in the ladies toilets only a short while before.More news: National Football League 2017 Week 10: Monday Night preview - Miami Dolphins at Carolina Panthers
Mendes, 19, who launched his career by posting song covers to the internet before getting signed to a record label, also scooped the "biggest fans" award.
"Look What You Made Me Do", singer Taylor Swift had been the most-nominated star of the evening, with six nominations, but failed to win any awards.
The minor blip didn't affect the rest of the night for Stormzy though, after he picked up the award for Best UK and Ireland Act at the ceremony.More news: Camelot Portfolios LLC Cuts Holdings in Cisco Systems, Inc. (CSCO)
Other big-name winners included Ed Sheeran, for best live act, and Dua Lipa, for best new performer. It was a busy night for Jared as he also presented U2 with the Global Icon Award at the spectacle, and thanked the Irish rockers for changing his life.
Shawn Mendes won the EMA Award for artist of the year, song of the year and "biggest fans", while Kendrick Lamar took home best video for "Humble". The "Suicide Squad" star looked less than impressed when MC Grindah joked it was nice to meet the 67-year-old TV presenter, before Rita Ora - who hosted the ceremony - corrected him.More news: Doctors from the city head to Belagavi to oppose KPME Act
The Detroit rapper also took the award for "Best Hip Hop", an honour which he appeared to find slightly baffling.
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