7 Songs You Had No Idea Katy Perry Actually Wrote Them for Others.

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Katy Perry wrote a lot of songs for other famous people.

1- Kelly Clarkson, "I Do Not Hook Up"

2- Selena Gomez & The Scene, "Rock God"

3-Jessie James, "Girl Next Door"

4- Britney Spears, "Passenger"

5- Iggy Azalea Featuring Rita Ora, "Black Widow"

6- Selena Gomez & The Scene, "That's More Like It"

7- Nicki Minaj Featuring Ariana Grande, "Get on Your Knees"