Katy Perry performs in Montreal with Justin Trudeau smiling from the audience A fan video showed Canadian Prime Minister Justin Trudeau attending Katy Perry’s concert in Montreal. (Video credit: @ridmi/TMX) NEW You can now listen to Fox News articles! Katy Perry has reportedly improved former Canadian Prime Minister Justin Trudeau's life with their blossoming romance. "Justin has had a lot of upheavals in the past couple of years, both in his professional-political status and at home with the