After being rushed to the hospital with the flu and being forced to cancel her Malmo, Sweden date, Rihanna is now being advised by doctors to stop partying.

According to The Sun, a source says that the 'We Found Love' singer has been working herself to the bone, while still indulging in the party scene. "Rihanna is running on empty but she's still been going out drinking and living it up," the source claims. "She doesn't have any down time where she can completely relax. She spends most of her time in the studio, on stage or in clubs."

The source reasons that the pop star's hectic schedule may be a cause for her recent decline in health. "Doctors are worried she's overdoing it," the insider adds. "She needs to take some time off. Otherwise she'll be vulnerable to more illness."

Rihanna is currently promoting her sixth studio album, 'Talk That Talk,' which is set to arrive on Nov. 21. Her first single from the LP, 'We Found Love,' recently became the Barbadian star's 11 No. 1 hit on the Billboard Hot 100 chart. According to a press release, the achievement also makes Rihanna the fastest solo artist in Billboard history to chart 20 Top-10 hits, second only to the Beatles.