Party girl Rihanna 'overdoing it'

London, August 13 (ANI): Rihanna has got her friends worried about her health as she is turning into a habitual drinker.

Rihanna has sparked more fears for her health after friends claimed that she "cannot put a drink down".

They say the Bajan babe never misses an opportunity to get sozzled.

And some fear she could be overdoing it, alleging the Drink To That singer, 24, had been "hours from rehab" at one point. She is regularly snapped boozing.

"She cannot put a drink down. Even when she's in the sea on a surfboard, she's got a beer," Daily Star quoted one of her friends as saying.

"You really don't see her going without a drink on any day of the week, ever," her friend said.

Back in April, the singer was also photographed snorting white powder off the head of a security guard at Coachella festival .

Rihanna's friends are worried that she is close to a burnout.

"There was a point when all her mates thought she was within hours of going into rehab," another source said. (ANI)