Is there really a beef between Rihanna and Ciara?

After watching this interview with Ciara I really like how she handled herself. She didn't bash Rihanna and try to be all sarcastic, she really expressed that she didn't know where it stemmed from. She even acknowledged that Rihanna has a lot going on right now in her words "she's rocking". My opinion, I just think it's catty girl issues nothing really substantial. Females don't yet along for no particular reason, we just don't rub each other the right way (pause) lol!! and we can't even explain it most of the time. Rihanna hasn't addressed the "beef" get so we don't know her side of the story. Any check out the video and come to your own conclusion...