Rihanna Sets New Chart Record

Rihanna has set a new chart record in the US. The singer's latest single "Stay" - featuring Mikky Ekko - has become her tenth number one on Billboard Mainstream Top 40 Radio Airplay Chart.

By having ten number one's Rihanna topples Katy Perry's record run of nine number one tracks on the same chart. The "Umbrella" singer also holds further records in the same chart, including most entries on the chart for an artist, with 35 songs.

While Rihanna's chart performances are holding up, she is having a hard time of her current Diamonds World Tour, and has had to cancel four shows in the US leg due to a recurring bout of laryngitis. After cancelling two shows in Texas earlier this month, she apologized to fans, writing on Instagram, "I kept working because I thought two days off after the Vegas show would be enough time to recover and I f****ed up, those were two days off from hell and today is not different! I'm sad and disappointed about it!"

Tonight Rihanna will perform in Baltimore, Maryland, the first of the previously cancelled shows she has rescheduled.

Gallery: Rihanna Sets New Chart Record

Rihanna Returns to the Stage

Rihanna resumed her Diamonds world tour last night. The "Stay" singer was back on stage in Philadelphia, Pennsylvania, after being forced to cancel two shows due to laryngitis, and appeared in good spirits ahead of the show.

"One of my favorite cities in America #PHILLYnation #DiamondsWorldTour WE BACK!!!!! (sic)," she wrote on Twitter.

Rihanna had to cancel dates in Boston and Baltimore after falling ill immediately after the first show of the tour in New York state and tweeted she was "embarrassed" about it: "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. I hate disappointing people that never ever let me down!! I'm so embarrassed about this! Thank you for your prayers and well wishes!(sic)."

The singer will reschedule both of the missed dates and intends to give fans a special show when they do happen.

(FYI - You can also follow Albumista on Twitter.)

Gallery: Rihanna Returns to the Stage