Does Katy Perry make her own songs up or does someone them for her?

Katy Perry co-writes most of her songs with other songwriters and producers. She has worked with many collaborators over the years, including Dr. Luke, Max Martin, Benny Blanco, and Sia. Perry is credited as a songwriter on all of her albums, and she has also written songs for other artists, such as Rihanna and Britney Spears.