Katy Perry has found herself in the unusual position of apologizing for something she said on Twitter about another artist's song...after he threatened her.

It all started a few days ago, when Katy tweeted, "Just heard a new song on the radio called 'I hate being sober' I now have serious doubt for the world."  That particular song, "Hate Being Sober," is by rapper Chief Keef, who unleashed a series of foul-mouthed tweets against Katy after being made aware of her comment, calling her a b**h, suggesting she perform a sexual act on him, and adding, "Ill Smack The Sh*t out her."  He also hinted that he was going to release a diss track about her, writing, "New song Katy Perry Coming Soon."

But Katy soon tweeted an apology to the rapper, writing, "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." She's referring to the fact that both Wiz Khalifa and 50 Cent appear on the track.

She added that she's actually fan of Keef's video for his song "Don't Like," and continued, regarding her comments on "Hate Being Sober," "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."

Keef appears to have accepted her apology, because he retweeted her comments.  Beef quashed!

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