Another celeb couple on the breakup list today.   Story below, from MTV:

Rihanna and Matt Kemp kicked off 2010 as a couple, but it seems they are bidding the year farewell apart. According to Us Weekly, the singer and her baseball-player beau have split.

"It happened over the last few weeks," a source told the magazine. "She basically was just over it." The insider added that the pop star has been "so busy" with work that "he just can't keep up with her crazy travel schedule."

The duo started dating in January and couldn't keep their relationship under wraps for long, but apparently Kemp got tired of dating a woman with a jet-setting lifestyle. "Matt's sick of always following after her like a puppy dog all over the world. He wants something more normal," the source explained. "It was never as serious as it looked. It was always just [about] having fun."