Lily Allen posted on her Myspace blog that after a 17 hour video shoot in LA, she is now back in London.
The LDN singer has been advised by doctors "to take a couple of weeks off."
She is suffering from Sinusitis and Strep throat.
As a result Allen has cancelled some of her upcoming gigs and hopes to be better in time for the V Festival.
She apologized to her fans and also posted a picture of herself holding a doctors note.