Chief Keef may hate being sober, but he doesn't seem to mind being nasty.

The rapper is now feuding with Katy Perry over a tweet she sent out on Wednesday, May 22: “Just heard a new song on the radio called ‘I hate being sober’ I now have serious doubt for the world."

"Hate Bein' Sober" is the name of Chief's song. He tweeted a series of responses: "Dat bitch Katy Perry Can Suck Skin Off Of my Dick. ... Ill Smack The Shit out her ✋ ... New Song Katy Perry Coming Soon."

Katy, showing much more maturity, tweeted: "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. I was really just having a general opinion on our generations desire to be constantly intoxicated. Believe me, I'm a lover not a hater. x"

Skipping over the irony of Katy Perry questioning the appeal of intoxication (has she heard her own song, "Last Friday Night"?), it looks like the beef with Keef is now over. He retweeted her apologies and then, in an unrelated note, tweeted this on May 24: "No Lie I Wanna Fuck Reggie Bush Baby mama Dat Look Like Kim K 😩😫"

He's all class, that guy.

Sources: @KatyPerry, @ChiefKeef, Gossip Cop