Rihanna's still sick.

The hard-partying singer canceled yet another tour date -- this one in Baltimore, M.D., last night (March 12) -- because she's suffering with the flu and laryngitis.

"Rihanna is still recovering," said a statement from Live Nation, her Diamonds tour promoter, adding that fans should retain their tickets as the show will be rescheduled.

She canceled her show in Boston on Sunday (March March 10), also as a result of her sickness. The next stop on the tour is Thursday (March 14) in Philadelphia, P.A.

Will she be ready to go by then? Your guess is as good as ours.