WASHINGTON – A Rihanna concert scheduled for Tuesday night at the 1st Mariner Arena in Baltimore has been postponed.

The singer is recovering from the flu and laryngitis, according to Live Nation.

The next Rihanna Diamonds World Tour performance is scheduled for Thursday at the Wells Fargo Center in Philadelphia and has not been canceled.

Rihanna canceled a performance in Boston on Sunday, and apologized to her fans through a tweet on Twitter.

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

— Rihanna (@rihanna) March 10, 2013

Live Nation says Boston and Baltimore fans should “retain their tickets pending rescheduling show date information.”

WTOP’s Stephanie Steinberg contributed to this report. Follow @WTOPLiving on Twitter.