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3 July 2012, 12:54
The 'We Found Love' singer was scheduled to appear later this week at the event in Spain.
Rihanna has cancelled her performance at the Rock In Rio Festival in Madrid this week following the news of her grandmother's death over the weekend.
The 'You Da One' star was set to appear at the event on Thursday (5th July) alongside the likes of Calvin Harris and Swedish House Mafia.
The event organisers made the announcement on their official website and confirmed that a replacement act will be announced soon.
The Bajan star expressed her grief after the death of her grandma Dolly in a post on her Twitter account.
She tweeted: "Goodbye #grangranDOLLY get your beauty rest until I see you."
The singer performed at Sweden's Peace & Love music festival following the news and is scheduled to headline the Wireless Festival in London's Hyde Park this Sunday (8th July).
You can view a picture of Rihanna with her grandma Dolly below:
Meanwhile, Rihanna has recently been in the UK filming her her new Sky Living fashion show.
The star has also been working on new material during her time in the Capital and told fans she made "magic" during her time across the pond.