Rihanna devastated after grandma's death

London, July 2 (IANS) Pop star Rihanna is devastated after her grandmother died of cancer.

The 24-year-old, who delayed a trip to Europe to visit her sick grandmother Clara 'Dolly' Braithwaite, has expressed her grief on Twitter, reports contactmusic.com.

"Goodbye grangran Dolly get your beauty rest until I see you," she tweeted.