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.

When Pierre Trudeau was the prime minister of Canada in the late 1960s, he became the focus of tabloids for sparking up a romance with a much younger singer, Barbra Streisand

In a pairing no one saw coming but everyone is now watching, former Canadian Prime Minister Justin Trudeau has been spotted attending Katy Perry’s Montreal concert. The gig comes just days after the two were filmed dining together at a high-end local restaurant.