Who wrote the song California gurls by Katy Perry?

Answer 1

The writing team responsible for California Gurls was Perry herself along with Bonnie McKee, Max Martin, Dr Luke and Snoop Dog (for the rap presumably).

The song was produced by Max Martin, Dr Luke and Benny Blanco - they are also responsible between them for such hits as

My Life Would Suck Without You, Since You Been Gone, So What, Dynamite, Dj Got Us fallin in Love Again, Who Knew, Cuz I Can, Tik Tok, Your Love Is My Drug, Take It Off, Baby One More Time, I Want It That Way, Behind These Hazel Eyes, I kissed A Girl, Hot N Cold, Teenage Dream, 3, If You Seek Amy, Circus, Magic, If I Had You, Whataya Want From Me, Girlfriend, Keep Holding On, Its My Life

You probably know most of those songs ;-)

Answer 2

It is not on any soundtrack but will be featured on her new CD "Teenage Dream" coming out August 24th.