The X Factor 2012 auditions are currently taking a break before moving to Newcastle next week, so we take a look back at the stars who have guest judged so far!
The X Factor audition tour has already stopped in Liverpool, London, Manchester and Glasgow with six different guest judges joining Gary Barlow, Tulisa and Louis Walsh.
Former Spice Girl Geri Halliwell was first to take on the challenge, although struggled to win over fans at the Liverpool's Echo Arena.
Former X Factor champ Leona Lewis joined the show last Saturday, while up and coming singer Rita Ora sat in on Monday last week Finally, Pussycat Doll Nicole Scherzinger joined the show last Wednesday for the final day of auditions at London's O2 arena.
Mel B became the latest guest judge last week, sitting on the panel for all three days of try outs in Manchester.
She was followed by US singer Anastacia who joined the show in Glasgow on Monday.
Browse pictures of the judges below...