British pop star Lily Allen has disappointed fans by cancelling a series of upcoming gigs across Europe after falling victim to illness. The Smile singer was due to play four dates later this month (Aug07), but has been forced to pull out of any performances while she recovers from sinusitis - a condition she believes has been caused by excessive world travel. Allen has pleaded with fans not to be disappointed by the cancellations, has apologised for feeling poorly. Posting on her MySpace blog - accompanied by a photo of her holding a doctor's note - she writes, "I've literally been around the whole world in two weeks from London to Japan around Australia and then to LA and Vegas then back to LA for a 17 hour video shoot , and now I'm back in London eating my mums chicken soup cause I'm afraid the travelling has caught up with me. "I've got sinusitis and strep throat (I don't even know what that is) and have been advised to take a couple of weeks off by a doctor in LA and a doctor here .Before anyone starts trying to accuse me of neglecting my fans I want to apologise and say how sorry I am , but I cant risk causing any permanent damage . I hope people can understand and aren't too angry." Gigs in Norway (10Aug), Sweden (11Aug), Portugal (15Aug) and Holland (17Aug) have been cancelled, but Allen hopes to honour her performance at the U.K.'s V Festival the following weekend (18-19Aug07).