Charlie Sheen has now picked Rihanna as his new nemesis, taking aim at the singer in a lengthy Twitter post for allegedly refusing to heet his fiancee, Brett Rossi. Rihanna later responded.

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Sheen had to use a Twitpic post to fully explain what happened. He said that he took Rossi and her girlfriends out for her birthday and Rihanna happened to be at the same restaurant. Rossi is a “huge fan,” so Sheen tried to set up a meeting, but there were apparently too many paparazzi around.

“well, the word we received back was that there were too many paps outside and it just wasn't possible at this time,” Sheen 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...?”

While Sheen says he understood the issue, he said that Rossi was very disappointed. “My Gal, however, was NOT OK with it,” he wrote. “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).”

Later, Sheen offered Rihanna advice, writing that if she wants to avoid paparazzi, she shouldn’t leave her house or she should quit being an entertainer.

“Here's a tip from a real vet of this terrain; If ya don't wanna get bothered DONT LEAVE YOUR HOUSE!” the Anger Management star wrote. “and if this ‘Prison of Fame’ is soooooooo unnerving and difficult, then QUIT, junior!”

As E! News notes, it appears that Rihanna did respond to Sheen with two tweets. “Goooorrrrrrlllllll......” she wrote. “If that old queen don't get ha diapers out of a bunch...”