Rihanna Vs. Charlie Sheen Beef: Epic Twitter Rant, Actor SLAMS Drake's Girlfriend 'Rude Ugly Idiot' after Fiancee Brett Rossi B-Day Diss

Apparently, Rihanna doesn't care to befriend Charlie Sheen's porn star fiancee, Brett Rossi. Well, the infamous "Anger Management" star has something not-so-nice to say about that!

Earlier this week, Drake's on-and-off girlfriend allegedly "shunned" Rossi. The "Pour It Up" songstress declined introductions to Sheen's new sweetheart. Both were dining at a restaurant, and RiRi refused to say "hi."

That REALLY ticked the former "Two and a Half Men" actor off.

On Thursday (May 22), the 48-year-old Hollywood bad-boy went on this epic Twitter rant:

@charliesheen: "so, I took my gal out to dinner last night with her best friends for her Bday. we heard Rihanna was present as well. I sent a request over to her table to introduce my fiancé Scotty to her, as she is a huge fan (personally I couldn't pick her out of a line-up at gunpoint). well, the word we received back was that there were too many paps outside and it just wasn't possible at this time. At this time? AT THIS TIME?? lemme guess, we're to reschedule another random 11 million to 1 encounter with her some other night...? no biggie for me; it would have been 84 interminable seconds of chugging Draino and 'please kill me now' that I'd never get back. My Gal, however, was NOT OK with it. Nice impression you left behind, Bday or not. Sorry we're not KOOL enough to warrant a blessing from the Princess (or in this case the Village idiot). you see THIS is the reason that I ALWAYS take the time. THIS is why I'm in this thing 31 awesome years. Good will and common courtesy, carefully established over time to exist radically in concert with a code of gratitude! I guess 'Talk That Talk' was just a big ol lie from a big ol liar. oh and Riahnna, Halloween isn't for a while. but good on you for testing out your costume in public. it's close; a more muted pink might be the answer, as in: none. See ya on the way down, (we always do) and actually,  it was a pleasure NOT meeting you. clearly we have NOTHING in common when it comes to respect for those who've gone before you. I'm guessing you needed those precious 84 seconds to situate that bad wig before you left the restaurant. Here's a tip from a real vet of this terrain; If ya don't wanna get bothered DONT LEAVE YOUR HOUSE! and if this 'Prison of Fame' is soooooooo unnerving and  difficult, then QUIT, junior! c #Hamateur."

Uh - WOW! Insane.

At one point in his rant, Sheen totally disses RiRi's new pink wig look.

The extreme tweet just went viral online.

Rihanna has yet to respond on Twitter... but how many readers think a new Hollywood "beef" is brewing?

UPDATE:

RiRi finally did tweet something back:

@rihanna: "If that old queen don't get ha diapers out of a bunch..."

And what does Sheen have to say to that? Well, check out his official (and rather scathing) statement issued to TMZ...