Los Angeles: Singer Katy Perry's father says her feud with "Shake it off" hitmaker Taylor Swift "ain't over yet". The two singers haven't seen eye-to-eye for some time, with Taylor's track "Bad blood" supposedly about Katy, who was a "straight-up enemy" that tried to "sabotage an entire tour". Though Katy has seemingly made reference to the tensions between them during Taylor's recent public spats with reality TV star Kim Kardashian and ex-boyfriend Calvin Harris, her mother Mary Hudson insists she's currently trying to "rise" above it all. But Katy's father Keith Hudson says that doesn't mean the end of their war, reports femalefirst.co.uk. "Katy released 'Rise'. It says, 'My feet have been put to the fire but I will rise'. That's what she's about right now," Mary said. Keith added to Britain's Grazia magazine: "You know it ain't over yet." Katy became embroiled in Taylor's row with Calvin -- who she split from in June, a few weeks before she began romancing British actor Tom Hiddleston -- after it emerged that Taylor secretly wrote his track "This is what you came for".