Rihanna apparently can't "stay" friends with everyone.

RiRi and singer Ciara have had beef in the past, and it appears to be reignited, according to E! Online.

Ciara was recently speaking about Rihanna in a radio interview and says that Rihanna's behavior confuses her.

"I don't know what her problem is," Ciara says about Rihanna. "I think she's nuts right now, like, whatever's going on, because for me, it doesn't make any sense."

Credit: Jason Merritt/Getty Images

"She has a lot of good things going on with herself," she continues. "A lot of good things — I've always said I've been happy for her. I don't get it. I really don't, but I wish her well. I wish her positivity."

And it seemed that Ciara did get enough of a chancce to air her grievances on the radio, since she then took to Twitter to say a few more words about Rihanna.

"I am baffled," Ciara writes. "The obsession really makes no sense. This is getting out of hand." 

"Somebody please point her in the right direction, 'cause she clearly needs love and affection. :)," Ciara writes, referring to Rihanna's tune, "Love Song."

It's unclear exactly what has sparked this new war of words, but it isn't the first time the two have had their issues.

In 2011, Ciara appeared on Fashion Police and said Rihanna "wasn't the nicest" to her.

At the time, Rihanna responded on Twiter by writing, "My bad Ci, did I forget to tip you?" Ouch.

Ciara is a 27-year-old singer who's best known for her 2004 debut album, which featured the singles "1, 2 Step" and "Goodies."

Let's hope these two can take the necessary "steps" toward patching things up. 

Source: E! Online