In the list of former flames, Katy ranked Diplo last out of the three. Harsh, right?
Don't feel too sorry for the DJ as he has come back swinging.
First, he claimed that he doesn't even remember dating Katy, telling James Corden: "I don't even remember!"
He then took to Twitter to sarcastically write: "I won the bronze metal!" Bronze being a reference to his coming third place.
Come on now Katy, did you really think you could diss your ex without getting a clap back?
That ain't how it works honey.