(Cover) - EN Showbiz - Rihanna has reportedly scrapped her plans to move to the UK for the summer due to "sickness."

The Barbadian singer was set to start filming a television show for Sky Living and had tweeted how excited she was for her 10-week stay.

But management for the 24-year-old starlet apparently claims she has to pull out of the deal because she's not up to it.

"She cancelled her trip and all work commitments in the UK at the very last minute, which is very unlike her," a source told the Britain's The Sun newspaper.

"She has been hitting it hard for months. She smokes, drinks and parties hard on top of work commitments."

Rihanna was last seen in Los Angeles on Monday night looking tired.

It is unknown if Rihanna will honour her commitments to perform at Radio 1's Hackney Weekend in a fortnight's time and next month's Wireless festival.

The Umbrella star caused concern last month when she posted a picture of her arm hooked up to an IV drip on her Twitter page and was said to be suffering from exhaustion. (C) Cover Media