Rihanna 'not happy' to be a size zero

Recently, the 24-year-old pop diva made the leap from the recording studio to the big screen with her star turn in ‘Battleship'.

Rihanna arrives for the premiere of 'Battleship' at a theatre in Los Angeles. Pic/AFP

"I want to do two more [movies] before touring again next year," The Us magazine quoted the singer as saying.

"My schedule is crazy!" she said.

In fact so jam packed is her schedule, that the Barbados-born Rihanna was hospitalized for tiredness following her appearance at the Met Ball last month, where she looked stunning in a black, reptile-inspired Tom Ford gown.

"I got no sleep [beforehand]," Rihanna said.

"It's harsh on your body!"

Her hospitalization - and her shrinking body - have some fans fretting that she's dealing with something more serious, though Rihanna assured that her nonstop schedule is the only thing to blame.

"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!" she added.

The 'Where Have You Been' singer is at work on her seventh CD.