Less than a month after Katy Perry announced her split from actor Orlando Bloom, some fans captured Justin Trudeau solo at her concert.

Justin Trudeau was totally vibing as he heard Katy Perry "Roar" at Wednesday's "Lifetimes" tour! Several videos posted by fellow concertgoers show the former Canadian Prime Minister with a cautious grin on his face ... swaying and completely locked in on KP as she belted out her biggest hits.