Rihanna (Getty Images)
The singer – who kicked off her 27-city "Diamonds World Tour" in Buffalo, New York, on Friday – had to cancel Sunday's show in Boston because she has laryngitis.
"#BOSTON this is the hardest thing for me to deal with," the 25-year-old tweeted on Sunday. "I feel like we've been waiting on this day forever, and I'm hurt that I let you down."
"I hate disappointing people that never ever let me down," continued RiRi, who is touring to support her seventh studio album, Unapologetic. "I'm so embarrassed about this! Thank you for your prayers and well wishes!"
Rihanna is hoping her inflamed larynx is healed by Tuesday – the date of her next show. As things stand, that tour stop – in Baltimore, Maryland – will proceed as scheduled.
Over the weekend Rihanna made headlines for sharing a funny story about how her mother, Monica Fenty, recently gave her a good scolding.
"I'm not afraid of any person in this world but my mother, I'm terrified of her," the singer, who is dating Chris Brown, told Elle U.K. "She called me two days ago and reeled me in about two naked pictures [my friend] Melissa put up on Instagram, a sneak peek from a photo book she's making about me.
"She went crazy on me, I was like, embarrassed," she continued. "I felt like I got my a** whipped in front of my class at school! She humbled the f**k out of me."
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