<P> There were three guest judges during the course of the season . The first, season 19 champion Alfonso Ribeiro, was a judge for Week 3 . Former pro dancer and season 18 champion, Maksim Chmerkovskiy, joined the judging panel for Week 5 . The following week, Olivia Newton - John appeared as a guest judge for Famous Dances Night . </P> <Table> <Tr> <Th> Date </Th> <Th> Guest </Th> <Th> Song (s) </Th> </Tr> <Tr> <Td> November 23, 2015 </Td> <Td> Meghan Trainor </Td> <Td> "Better When I'm Dancin"' / "Like I'm Gonna Lose You </Td> </Tr> <Tr> <Td> Who Is Fancy, Ariana Grande, & Meghan Trainor </Td> <Td> "Boys like You" </Td> </Tr> <Tr> <Td> November 24, 2015 </Td> <Td> Chaka Khan </Td> <Td> "I'm Every Woman" </Td> </Tr> <Tr> <Td> Elle King </Td> <Td> "Ex's & Oh's </Td> </Tr> <Tr> <Td> Andy Grammer </Td> <Td> "Good to Be Alive (Hallelujah)" </Td> </Tr> <Tr> <Td> Chaka Khan & Andy Grammer </Td> <Td> "Baby, It's Cold Outside" </Td> </Tr> <Tr> <Td> Alexander Jean </Td> <Td> "Roses and Violets" </Td> </Tr> <Tr> <Td> Nick Carter </Td> <Td> "I Will Wait" </Td> </Tr> </Table> <Tr> <Th> Date </Th> <Th> Guest </Th> <Th> Song (s) </Th> </Tr> <Tr> <Td> November 23, 2015 </Td> <Td> Meghan Trainor </Td> <Td> "Better When I'm Dancin"' / "Like I'm Gonna Lose You </Td> </Tr>

Who is left on dancing with the stars season 21