After being hit with a double whammy of the flu and laryngitis, Rihanna's pulled out of her second concert this week.

The 25-year-old was supposed to perform in Baltimore on March 12, but the show's since been postponed. On Sunday, the "Diamonds" singer also had to cancel her Boston show because of her illness.

"#BOSTON this is the hardest thing for me to deal with! I feel like we've been waiting on this day forever, and I'm hurt that I let you down," Rihanna tweeted March 10. "I hate disappointing people that never ever let me down!! I'm so embarrassed about this! Thank you for your prayers and well wishes!"

Her Twitter account has been quiet since, and according to a statement, she's still trying to recuperate. She plans to next take the stage on March 14 in Philadelphia.

If you bought tickets for either her Boston or Baltimore show, you should hold on to them pending more information about rescheduling her dates.