Photo source: Twitter.

Rihanna has disappointed thousands of fans after cancelling her Baltimore concert tonight !!!!

The pop princess came down with the flu and laryngitis at the weekend, forcing her to cancel tonight's Diamonds World Tour stop in Maryland. She also called off her appearance in Boston on Sunday for the same reasons, tweeting the following to her fans:

"I hate disappointing people that never ever let me down!! I'm so embarrassed about this! Thank you for your prayers and well wishes!"

Distraught fans have been advised to hold onto their tickets in case the concerts are rescheduled.

Read the full story according to E! Online HERE !

Let's hope Ri-Ri is feeling better by the time she visits the SF Bay Area for her concert in San Jose on April 6 !!!!

Photo source: Twitter.