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Following Rihanna’s recent hospital visit, “Katy told her she has to slow down,” a source says, adding that Katy even suggested her BFF come stay at her home.

Katy Perry’s desperate to get gal pal Rihanna into treatment following the “We Found Love” singer’s dramatic hospitalization in Malmo, Sweden on Oct. 31. “Katy begged Rihanna to take some time off and get therapy,” a source says. “Rihanna’s been running on empty. And rather than resting, she’s drinking and clubbing until the early hours of the morning.”

While the Bajan-born pop star may seem like she’s flying high, Katy knows all too well how down her BFF really is — and worries that Rihanna’s still struggling with her failed raltionship with Chris Brown.

“Rihanna’s been self-medicating with booze ever since their split, and it’s not getting better,” the source says. “She calls Katy in tears, saying how down she is and that her life’s controlled by her label. She just wants a loving boyfriend. ”

Katy, 27, can certainly understand the pressure RiRi is under — constant jet-lag, strenuous shows and nonstop photo ops. But Rihanna seems to be sinking under the stress, and even Katy’s husband Russell Brand, a recovering addict himself, has expressed concern. “He told Katy that she had to step in because Rihanna is on a very slippery slope,” continues the source. So far, Rihann, 23, seems receptive to her friends’ intervention. “She’s touched that they want to help, and she agrees that she must stop,” says the source. “She doesn’t want to be the next Amy Winehouse.”

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