June 14, 2012 at 7:43 AM ET
Rihanna is running herself ragged.
The unattached, "Where Have You Been" singer, 24, is at work on her seventh CD -- and trying to squeeze in some more zzz's! Recently, she opened up to Us Weekly about her jam-packed calendar -- and the effect it's having on that famous beach bod.
Recently, the pop diva made the leap from the recording studio to the big screen with her star turn in "Battleship." "I want to do two more (movies) before touring again next year," Rihanna gushed to Us of her filming experience, even though, "My schedule is crazy!"
So crazy, in fact, that the Barbados-born beauty was hospitalized for fatigue following her appearance at the Met Ball last month, where she stunned in a black, reptile-inspired Tom Ford gown.
"I got no sleep (beforehand)," Rihanna explained. "It's harsh on your body!"
"I'm a size 0 -- and not happy about it!" she says. "I went way too far. I prefer myself a bit chunkier. I want my old butt back!"