Rihanna "Embarrassed" After Cancelling Boston Gig

Rihanna may have only just started her Diamonds world tour, but the star has already been forced to cancel a show.

RiRi kicked off her jaunt in Buffalo in the US on Friday (March 8) but was struck with laryngitis - meaning her gig at the TD Garden in Boston on Sunday was postponed.

A spokesperson for Live Nation confirmed: "Unfortunately, following her sold out concert on Friday, Rihanna has contracted laryngitis and per doctor's instruction is unable to perform this evening."

The Bajan babe herself later took to Twitter to apologise to her fans, writing: "‪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 added: "I hate disappointing people that never ever let me down!! I'm so embarrassed about this! Thank you for your prayers and well wishes!"

The 25-year old is expected to return to the stage for her show in Baltimore on Tuesday (March 12).

Over the weekend, Ryan Seacrest suggested that the We Found Love hitmaker is planning to take a year off before recording her eighth studio LP.

SEE RAUNCHY PICS OF RIHANNA IN MTV'S GALLERY HERE!