Katy Perry to write song dissing Taylor Swift

The song is expected to be a retaliation against Taylor's scathing hit 'Bad Blood' which took aim at Katy, who Taylor once described as her "straight-up enemy".

Katy Perry and Diplo have teamed up for a Taylor Swift diss track.

The former lovers have reportedly got together in the studio and bonded once again over their mutual hatred of the 'Shake It Off' singer by penning a track titled 'Crocodile Tears'.