Cheryl went to a photoshoot and although she had a high temperature and felt nauseous, she insisted she felt fine and went on with the shoot like a little trooper.

However sources say that during the shoot she started looking very pale and clammy and then fainted.

She was whisked to the doctors who diagnosed her with gastroenteritis and told her that she must do nothing but rest completely for one week.

That meant that she had to let Simon Cowell know that she will have to miss one of the recordings of The X Factor.

We wonder if they'll rope anyone to fill in for her? Our vote is for Katy Perry!