{blackbabes} Rihanna Talks Heartache on Stage Amid Chris Brown Breakup Rumors

Is Rihanna once again dealing with a broken heart?

The subject certainly seemed to be on her mind Monday at a Staples Center concert in Los Angeles, as rumors of trouble with boyfriend Chris Brown have begun to circulate.

"How many of you are in love? How many of you hate love? How many of you don't f––ing understand it? I'm in that group," Rihanna said on stage, before singing "What Now," from her most recent album.

The lyrics to that song begin: "I've been ignoring this big lump in my throat/I shouldn't be crying, tears were for the weaker days/I'm stronger, now what, so I say/But something's missing."

Despite her soul-searching, Rihanna was still all smiles during the show, according to concertgoers, even encouraging the crowd to get a little rowdy.

"Los Angeles, what the f––k?," she said at one point. "I live here now, so I know y'all can get ratchet."

Rihanna and Brown, 23, recently reunited, despite the 2009 incident that sent Brown to jail. Rihanna recently spoke of her happiness at having a fresh start with Brown.