We didn't see this celebrity feud coming!

Charlie Sheen isn't one to sugar coat his true feelings, and the actor let his distaste for Kim Kardashian be known in his latest Twitter rant, in which he slammed the reality star for refusing to sign an autograph for a young fan. The Hollywood bad boy even took it so far as to insult her famous derriere in the process!

The former Two and a Half Men star recounted how a friend told him that the Keeping Up with the Kardashians star turned away a 6-year-old who asked for her John Hancock, leaving the little one distressed. "She cries about it every night before she goes to sleep," he tweeted. He then proceeded to take some below-the-belt shots at Kimmy K!

"You are lucky that ANYONE cares about your gross and giggly [sic] bag of funk you dare call an ass," he continued. He even took a backhanded swipe at her husband Kanye West! "My apologies to your hubby, great guy I’m sure, I hope his vision returns one day," he sniped.

"Zero gratitude, zero awareness, zero talent, a pox on the face of entertainment she is!" Sheen told TMZ after his tweets went viral. Guess he's not backing down!

The only person that loves a good Twitter rant more than Chuckles is Yeezy, so we will have to wait and see how this turns out!