<P> In its first season, the judging panel consisted originally of David Hasselhoff, Brandy Norwood, and Piers Morgan, with the program hosted by Regis Philbin . Prior to the start of the second season, Norwood was forced to step down due to a legal matter she was caught up in, leading to her being replaced by Sharon Osbourne, while Philbin was replaced by Jerry Springer as the show's host . Further changes were made to the panel and show's host, as a direct result of each respective member having a need to focus on other TV commitments - Springer was forced to leave after the third season, and was replaced by Nick Cannon for the fourth season; Hasselhoff left the show after the fourth season, and so was replaced by Howie Mandel for the fifth season as a direct result; Morgan left after the sixth season, leading to him being replaced by Howard Stern for the seventh season . </P> <P> In August 2012, Osbourne left the program following a dispute with NBC . While the network replaced her with former Spice Girls member Mel B in February 2013, the production staff decided to expand the number of judges in the panel to four - such a format change had already been occurring in other international versions of the competition, such as on Britain's Got Talent two years prior . In March 2013, supermodel Heidi Klum was announced as joining the panel for the eighth season, confirming reports that the show would include a fourth judge into its format . In October 2015, Stern was replaced by Simon Cowell for the eleventh season . After his eighth year hosting America's Got Talent, Cannon announced plans to retire from the show due to comments he made about the network; despite being under contract to continue his hosting duties, NBC eventually replaced him with Tyra Banks for the twelfth season . </P> <Table> <Tr> <Th> Season </Th> <Th_colspan="4"> Judge Cuts Guest Judge (in order of appearance) </Th> </Tr> <Tr> <Th> 10 </Th> <Td> Neil Patrick Harris </Td> <Td> Michael Bublé </Td> <Td> Marlon Wayans </Td> <Td> Piers Morgan </Td> </Tr> <Tr> <Th> 11 </Th> <Td> Ne - Yo </Td> <Td> Reba McEntire </Td> <Td> George Lopez </Td> <Td> Louis Tomlinson </Td> </Tr> <Tr> <Th> 12 </Th> <Td> Chris Hardwick </Td> <Td> DJ Khaled </Td> <Td> Laverne Cox </Td> <Td> Seal </Td> </Tr> <Tr> <Th> 13 </Th> <Td> Ken Jeong </Td> <Td> Olivia Munn </Td> <Td> Martina McBride </Td> <Td> Chris Hardwick </Td> </Tr> </Table> <Tr> <Th> Season </Th> <Th_colspan="4"> Judge Cuts Guest Judge (in order of appearance) </Th> </Tr>

Who guest judged on america's got talent
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