Rihanna exits Giorgio Baldi restaurant in Santa Monica, Calif. (June 3, 2012)

*A fresh round of rumors about Rihanna’s health (aka excessive partying) has emerged in the wake of her sudden cancellation of a 10-week business trip to the UK.

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The 24-year-old was scheduled to fly into London yesterday (June 6) to film a TV special at the beginning of the 2 ½ month stay, but the singer has suddenly cancelled all her British commitments, prompting speculation she has been partying too hard.

UK tabloid The Sun quoted Rihanna management as saying her trip was cancelled due to “sickness.” A source added: ”She cancelled her trip and all work commitments in the UK at the very last minute, which is very unlike her.  She has been hitting it hard for months. She smokes, drinks and parties hard on top of work commitments.”

Riri has commented on the Sun report, tweeting that she pulled out of her commitments because she wants to spend more time with her family.

“Nonsense! I’m not sick,” she tweeted. “I pushed my trip to London back to go spend time with my family! Sorry kiddos.” She then cursed out the publication, tweeting: “The Sun newspaper is like a f***in ass hair, full of s**t!!!!!!”

Rihanna’s scheduled 10-week stint in London was serving as both a promotional tour for her and also for the filming of her new Sky Atlantic fashion show. She also had two shows at Radio 1’s Big Weekend in Hackney, London, in two weeks as well as playing as part of Wireless in the capital’s Hyde Park.