The rumored new couple stepped out together in Montréal recently, and a source tells PEOPLE they're "interested in each other"

Justin Trudeau was spotted at Katy Perry's Lifetimes Tour at Montreal's Bell Centre on Wednesday, July 30. Trudeau, 53, was seen in the crowd wearing a casual t-shirt as he smiled while watching the singer's performance.

Katy Perry has made a heartfelt announcement amid dating rumors with Justin Trudeau.After sparking romance speculation following a dinner date with the former Canadian Prime Minister earlier this week,