Credit: Kevin Mazur/

Rihanna and Chris Brown are once again following each other on Twitter -- but not everyone is pleased about it.

After one of her fans noticed that Rihanna, 23, was following her bad boy ex, she wrote: "I never thought you would go back to him! You better not. It's your life, but you do have people that look up to you (e.g. young girls)."

The "S&M" singer wasted no time responding, telling her concerned fan, "It's f*cking Twitter, not the altar! Calm down!"

(Brown, 22, has yet to address the incident on his own Twitter account).

Rihanna soon realized she may have been a bit harsh, so she offered up a gentler apology. "Baby girl, I'm sorry," she wrote. "I didn't mean to hurt or offend you -- just needed to make it clear!"