Britain's Got Talent's head judge, Simon Cowell, reportedly fell ill during the first round of auditions in Birmingham, with a huge star being forced to 'step in at the last minute' to replace the 65-year-old judge so that bosses wouldn't have to cancel the day's auditions. Stacey Solomon , who rose to fame after her appearance on The X Factor in 2009, appeared in his place as a guest judge while Simon recovered. Stacey took to Instagram to share clips and photos from the filming, including

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