Simon Cowell replaced on Britain's Got Talent after falling ill during auditionsBritain's Got Talent judge Simon Cowell is said to have fallen ill during auditions in Birmingham, with a huge star being forced to 'step in at the last minute' to replace himView 2 Images Simon Cowell (Image: ITV)Britain's Got Talent's chief judge Simon Cowell is understood to have become unwell during the opening round of auditions in Birmingham, with a major celebrity having to 'fill in at short notice' to cover for the 65-year-old panellist so producers wouldn't need to scrap the day's tryouts. ‌Stacey Solomon, who gained recognition following her stint on The X Factor in 2009, is believed to have served as the substitute judge whilst Simon recuperated. ‌"So many people were disappointed when yesterday's auditions were cancelled they didn't want that to happen again, so Stacey was a great sport and stepped in." Amid the confusion among fans and BGT hopefuls, a source alleged that the auditions were delayed due to head judge Simon, 65, falling ill. Judges often miss the odd audition because they don't feel great - Simon, for example, has long suffered with migraines.