Time for Rihanna to pen a new break-up ballad: After almost a year together, she and Matt Kemp have called it quits, an insider close to the singer tells UsMagazine.com.
"It happened over the last few weeks," explains the source. "She basically was just over it."
A rep for Rihanna (she's currently vacationing with family in her native Barbados) could not be reached for comment.
Los Angeles Dodgers outfielder Kemp, 26, helped Rihanna, 22, move on from Chris Brown, who...