The pop star also opened up about one of the hardest years of her life: "I just kept going, because I made a promise to my fans, I made a promise to my daughter, I made a promise to myself."

Katy Perry and Justin Trudeau are red-carpet official after a year, with the two stepping out for Perry's film premiere at the Tribeca Festival.

Katy Perry and Justin Trudeau had all eyes on them as they walked hand-in-hand at the Tribeca Festival.