<Li> A book was released in 2013 titled, Inside AGT: The Untold Stories of America's Got Talent . It describes the seasons, contestants, judges, and production techniques of the show and contains detailed interviews with contestants from all seasons . </Li> <P> Starting with the tenth season, each of the main judges invited a guest judge to join the judging panel for one night during the Judge Cuts stage of the competition . The guest judges had the ability to employ the golden buzzer to bypass the other judges and advance an act to the live shows . The first guest judge, Neil Patrick Harris, appeared at the invitation of Howard Stern in episode eight of season ten, which aired on July 14, 2015 . Michael Bublé appeared at the invitation of Heidi Klum in episode nine of season ten, which aired on July 21, 2015 . Marlon Wayans appeared at the invitation of Howie Mandel in episode ten of season ten, which aired on July 28, 2015 . Piers Morgan appeared at the invitation of Mel B in episode eleven of season ten, which aired on August 4, 2015 . Beginning with the eleventh season the guest judges were announced without any indication if they were invited by one of the regular judges . This continued into the twelfth season when the guest judges were announced by NBC through various outlets . </P> <Table> <Tr> <Th> Season </Th> <Th_colspan="4"> 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> </Table> <Tr> <Th> Season </Th> <Th_colspan="4"> Guest Judge (in order of appearance) </Th> </Tr>

Who's the special judge on america's got talent