https://cdnph.upi.com/ph/st/th/4591781013626/2026/upi/9fab0a2b16c412496f6eeeaecf44fa00/v1.5/Katy-Perry-Justin-Trudeau-make-red-carpet-debut-as-couple.jpg" /> Katy Perry and former Canadian prime minister Justin Trudeau attended the Tribeca Film Festival premiere of her "Lifetimes Tour" concert film.