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Shawn Mendes arrives on stage with Marshmello's mask at the iHeartRadio MMVAs in Toronto, on Aug. 26, 2018.

Christopher Katsarov/The Canadian Press

Shawn Mendes pocketed four awards and stole the hearts of countless screaming teenagers at the iHeartRadio MMVAs on Sunday.

The Pickering, Ont.-raised singer was the recurring star of the Toronto street party. He opened and closed the show with performances of his songs “Lost in Japan” and “In My Blood,” but also turned up several more times to dish out love to his Canadian fans.

“This is home,” he said while clutching the MMVA for artist of the year.

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“This means the absolute world to me.”

The pop singer picked up three other MMVAs, best pop artist and two awards voted by viewers — fan fave artist and video.

He also slipped onto the stage to accept one that wasn’t his own

Mendes left the crowd screaming with delight after he revealed himself underneath the disguise of another musical star, electronic producer Marshmello. The mysterious Top 40 DJ has maintained his anonymity for years, so seeing Mendes mugging in the costume was a total shock.

“Woah, what happened there?” the international star jokingly exclaimed as he dove into a fake acceptance speech.

Mendes didn’t have to trek too far to accept his armload of awards. He recently bought a condo in downtown Toronto, which he said made it easy to show up in the heart of the city.

“I live around the corner,” he said on the red carpet before the show.

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“I was at my house 30 minutes ago. It’s really cool to be home one minute and hanging out with your friends, and the next minute being here.

The MMVAs were packed with plenty of other star power, including Australian act 5 Seconds of Summer, Chinese singer Kris Wu and 1990s boy band 98 Degrees who all performed.

Host Awkwafina opened the show dressed in striped pyjamas as she charged into a spirited monologue that proved she hasn’t changed much, despite starring in “Crazy Rich Asians,” which sits atop the North American box-office for a second week.

“I’m still that girl with the voice of a pro-wrestler and the body of a Pikachu,” the vibrant YouTube rapper told the crowd.

But she also wanted to clarify one thing for viewers who might be seeing her on TV for the first time.

“I am not Sandra Oh, all right?” she said, referring to the Ottawa-born actress who’s Emmy-nominated for her turn in “Killing Eve.”

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“That’s another Asian woman — and she’s great.”

Meghan Trainor delivered a mash-up of her new song “No Excuses” alongside other fan favourites that included the Top 40 hit “Me Too.”

Model and TV host Tyra Banks showered Trainor with compliments after the performance.

“What I love about Meghan Trainor is she keeps it beautiful and she keeps it real,” Banks said. The two shared a moment earlier on the red carpet where they expressed their mutual admiration for each other.

Other awards handed out on the broadcast included song of the summer, which went to Canadian DJ duo Loud Luxury for “Body,” a hit that’s been spun frequently on radio stations nationwide in recent months.

Best collaboration was awarded to Bebe Rexha and Florida Georgia Line for “Meant To Be,” a rare cross-over hit for country and pop music. Rexha raced onto the stage, threw her head back and let out a hearty scream.

Alessia Cara accepted the video of the year award for “1-800-273-8255” a suicide prevention anthem by Logic. The Brampton, Ont.-based pop singer lent vocals to the song alongside R&B singer Khalid.

“I’m accepting this but this is not my award — this is Logic’s award,” Cara said, acknowledging the absent rapper. She also gave a shoutout to the music video’s director Andy Hines, who is from Nova Scotia.

Aside from the accolades, a number of stars also used their platform to talk about acceptance and activism.

Viral pop singer Halsey appeared on the red carpet pre-show to receive the “artist for change” award. She used the opportunity to address why she often talks about mental health awareness and suicide prevention.

“I think if you end up with a platform, you need to use that platform to uplift the people that gave you that platform to begin with,” she said.

Michael Jackson’s son Prince, who was a presenter, urged the audience to consider the power of their own voice, and to get behind causes that matter to them, such as education reform and ending homelessness.

“You’re never too young to speak out and stand up,” he said.

A list of the winners at the 2018 iHeartRadio MMVAs

  • iHeartRadio MMVA Artist for Change — Halsey
  • Best Rock/Alternative Artist or Group — Imagine Dragons
  • Best Pop Artist or Group — Shawn Mendes
  • Best EDM/Dance Artist or Group — Marshmello
  • Best Hip Hop Artist or Group — Drake
  • Best Director — Drake - “God’s Plan” (Director: Karena Evans)
  • Video of the Year — Logic feat. Alessia Cara and Khalid - “1-800-273-8255”
  • Single of the Year — Ed Sheeran - “Perfect”
  • Artist of the Year — Shawn Mendes
  • Song of the Summer — Loud Luxury ft. Brando - “Body”
  • Best Collaboration — Bebe Rexha and Florida Georgia Line - “Meant To Be”
  • Best New Canadian Artist or Group — Elijah Woods x Jamie Fine
  • Fan Fave Artist — Shawn Mendes
  • Fan Fave Duo or Group — BTS
  • Fan Fave Video — Shawn Mendes - “In My Blood”
  • Fan Fave Single — Selena Gomez feat. Marshmello - “Wolves”
  • Fan Fave New Artist — Kris Wu
  • Fan Fave Much Creator — Dan Rodo - “TheDanocracy”