Charlie Sheen and Rihanna exchanged insults Thursday after the "Anger Management" star sharply criticized the singer for allegedly snubbing him and his fiancee at a Santa Monica restaurant.

"So, I took my gal out to dinner last night with her best friends for her birthday," Sheen tweeted Thursday. "We heard Rihanna was present as well. I sent a request over to her table to introduce my fiancee to her, as she is a huge fan. . . . Well, the word we received back was that there were too many [paparazzi] outside and it just wasn't possible at this time," Sheen, 48, wrote. "At this time? AT THIS TIME?? Lemme guess, we're to reschedule another random 11 million to 1 encounter with her some other night . . .?"

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He continued with a long reprimand beginning, "Sorry we're not KOOL enough to warrant a blessing from the princess (or in this case the village idiot)."

He also ridiculed her pink wig.

His fiancee, the former adult-film actress Brett Rossi, tweeted, "We had our own private room where there was plenty of privacy. She was in the main dining room . . . Our security team respectfully asked her security team . . . We weren't asking her to come outside for a photo shoot. We just wanted to just extend a friendly 'hello' after she finished her meal."

Without referring specifically to Sheen, Rihanna tweeted Thursday, "If that old queen don't get ha diapers out of a bunch . . ." Sheen later responded in a long poem sent to, which included the line, "want to thank you for recognizing me as Royalty. I'm flattered."