If you were at the Katy Perry concert in Montreal, there's a chance you heard former Prime Minister Justin Trudeau "Roar" among the crowd.

Justin Trudeau was lit up like a firework at Katy Perry’s Montreal concert Wednesday night. Fresh off his dinner date with the “Dark Horse” pop star, the former Canadian prime minister, accompanied by his teenage daughter, was spotted beaming and singing along to Perry’s greatest hits at the singer’s Bell Centre stop on her Lifetimes tour.

Amid speculations about their dating, Justin Trudeau was spotted enjoying his heart out at Katy Perry's concert, along with his daughter, Ella-Grace.