The "Firework" singer shared a new date night pic with the former Canadian prime minister.

Some of these might surprise you. From Katy Perry to Bob Dylan, here are artists that have had a Christian music era.

All the latest news and updates on American singer Katy Perry, who is best known for songs including Firework (2010), California Gurls (2010) and Roar (2013). She was previously a judge on talent show ...