Do any celebrities get along these days? Charlie Sheen added another star dispute to the already long list when he posted a scathing vent about a run-in with Rihanna.

According to the actor, he was at dinner with his fiancée Scotty when he got word that RiRi was dining somewhere in the same restaurant. Thinking it would be a cool opportunity for big fan Scotty to meet the singer, he sent a message to her table asking if he could introduce them.

Charlie said of Rihanna’s response, “Well, the word we received back was that there were too many paps outside and it just wasn’t possible at this time.”

Apparently that was enough to set off the ‘Two and a Half Men’ star. “At this time? AT THIS TIME??” he wrote. “Lemme guess, we’re to reschedule another random 11 million to 1 encounter with her some other night…?”

He continued to go off on the singer and her lack of “respect for those who’ve gone before you,” presumably referring to his own lengthy, if not rocky, Hollywood career. Though he claims he’s glad he didn’t end up meeting her — comparing it to chugging Draino — he sure had a lot to say about the non-meeting. And he wasn’t kind about it, either. Charlie got pretty personal and nasty, going so far as to make comments about Rihanna’s appearance.

Read the rest of his remarks below, which he posted in full here.

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:

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
and if this "Prison of Fame"
is soooooooo unnerving and
difficult, then QUIT, junior!

UPDATE: Uh oh... the situation continues to get messier. Rihanna started posting her own response on Twitter this afternoon in the form of several indirect but obvious tweets.

Charlie brought it to an even nastier level in his shocking response sent to TMZ, issuing a statement in the same poem-like format he used for his first Twitter bash.

Dear Ms. Rihan-
oh wait, no last name,
Okay, Dear R -
clearly English is NOT
your primary language.

Firstly I want to thank you for recognizing me as Royalty. I’m flattered.
And secondly;
do the good Queen a favor and go tend to the dungeon in my Castle.
But beware of the
rats and the snakes.
They stir with folly
awaiting your tepid advance,
in the shadows…”

later Doosh!

We'll have to stay tuned to see if they keep fighting for the last brutal word.