Chief Keef is back in the news.
But not because his baby mama has sued him for child support. And not because the 17-year old was arrested for pot possession.
No, this time, Keef just said some REALLY mean things to Katy Perry.
It all started when Perry Tweeted on Wednesday: "Just heard a new song on the radio called ‘I hate being sober’ I now have serious doubt for the world."
At that, the young rap star went off.