Rihanna Is "Not Happy" About Being a Size Zero

Rihanna knows that she has a a tiny frame these days, but she insists there's an easy explanation for her thinner figure: She's so busy she barely has time for such basic necessities as eating and sleeping regularly.

The "Where Have You Been" singer, 24, told Us Weekly just how many projects she has lined up, including her seventh studio album and more films. And now that she's made her acting debut in the action thriller "Battleship," the pop star plans to try her hand at the big screen again.

"I want to do two more [movies] before touring again next year," Rihanna said. "My schedule is crazy!"

Her crazy schedule explains why the Barbados-born beauty was hospitalized for fatigue shortly after attending the Met's annual costume ball last month. RiRi stunned her fans with a body-skimming black Tom Ford gown that made it obvious how tiny the singer-actress had become.

"I got no sleep [beforehand]," Rihanna explained. "It's harsh on your body!"

Her hospitalization worried fans that she was dealing with a serious illness, but Rihanna assured Us Weekly it's just her nonstop obligations that have caused her to drop too many pounds.

"I'm a size 0 -- and not happy about it!" she said. "I went way too far. I prefer myself a bit chunkier. I want my old butt back!"

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