<P> In 2011, the panel saw its first major change, when Morgan revealed he was leaving the show to travel to America and begin filming of his new show . As Cowell had announced he wouldn't be present for the fifth series' auditions, due to his busy schedule with launching The X Factor USA, the show's producers decided to amend the panel, and recruited comedian Michael McIntyre, and actor, singer and former America's Got Talent judge David Hasselhoff, to join Holden during the auditions, with Walsh returning as a guest judge for the London auditions due to Hasselhoff's commitments with a pantomime at that time . When the series entered its live episodes, Cowell returned to oversee the acts as a fourth judge . Later that year, in October 2011, both Hasselhoff and McIntrye declined to return for the sixth series, while Cowell announced he was returning full - time to the show . </P> <P> On 2 January 2012, the producers revealed its decision to adopt the use of a fourth judge for the programme's format, announcing that both Cowell and Holden would now be joined by David Walliams and Alesha Dixon for the sixth series, with the latter moving to the talent show after deciding to leave BBC's Strictly Come Dancing . During filming in February, Holden was unable to attend the London auditions, due to having given birth to her daughter at that time which had led to her suffering some after - effects from her pregnancy . As a result, the producers brought in actress and model Carmen Electra as a guest judge until she recovered . In subsequent series, the line - up remained as Cowell, Holden, Walliams and Dixon, with no further incidents except for the eighth series in 2014 - Cowell missed the first day of the Manchester auditions, leading to Ant & Dec filling in for him, and was also absent for the final day of the London auditions - and the tenth series in 2016 - Cowell was late for an audition, and was temporarily replaced by Walliam's mother Kathleen, who was attending it . </P> <Table> <Tr> <Th> Series </Th> <Th_colspan="4"> Main Judge </Th> <Th> Guest Judge </Th> </Tr> <Tr> <Th> </Th> <Th> </Th> <Th> </Th> <Th> </Th> </Tr> <Tr> <Th> </Th> <Td> Simon </Td> <Td> Amanda </Td> <Td> Piers </Td> <Td> N / A </Td> <Td> N / A </Td> </Tr> <Tr> <Th> </Th> </Tr> <Tr> <Th> </Th> <Td> Kelly </Td> </Tr> <Tr> <Th> </Th> <Td> Louis </Td> </Tr> <Tr> <Th> 5 </Th> <Td> Michael </Td> <Td> David H . </Td> </Tr> <Tr> <Th> 6 </Th> <Td> Alesha </Td> <Td> David W . </Td> <Td> Carmen </Td> </Tr> <Tr> <Th> 7 </Th> <Td> N / A </Td> </Tr> <Tr> <Th> 8 </Th> <Td> Ant & Dec </Td> </Tr> <Tr> <Th> 9 </Th> <Td> N / A </Td> </Tr> <Tr> <Th> 10 </Th> <Td> Kathleen </Td> </Tr> <Tr> <Th> 11 </Th> <Td> N / A </Td> </Tr> <Tr> <Th> 12 </Th> </Tr> </Table> <Tr> <Th> Series </Th> <Th_colspan="4"> Main Judge </Th> <Th> Guest Judge </Th> </Tr>

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