Rihanna and Matt KempDespite reports of a breakup, Rihanna and boyfriend Matt Kemp are blaming their busy work schedules for why they haven't been spotted together recently. A music source tells PopEater that the couple has not formally split ... yet.

"They are both extremely busy in their careers and that causes problems when there is little time to get together," says the source when describing the couple's one-year relationship.

But speculation about an impending split continues, as pair has even canceled their holiday plans together to focus on work.