The pop star expressed her disgust with the song about drinking and taking drugs. She posted on Twitter: "Just heard a new song on the radio called I Hate Being Sober... I now have serious doubt for the world."
Keef tweeted in response: "Dat (sic) b**ch Katy Perry... I'll smack the s**t out her."
In order to stop a feud from blowing up, Perry clarified her remarks. ""Mr. Keef! I'm sorry if I offended you. I heard a lot of people guesting on the song & didn't even know it was you in particular. Actually... I'm a fan of your Don't Like video tbh (to be honest). I was really just having a general opinion on our generation's desire to be constantly intoxicated. Believe me, I'm a lover not a hater."
Meanwhile, it's been rumored that Perry has been hooking up with "Twilight" star Robert Pattinson. Now that's a way to start a feud - with his ex-girlfriend and co-star Kristen Stewart.