<P> The format of the show consists of a celebrity paired with a professional dancer . Each couple performs predetermined dances and competes against the others for judges' points and audience votes . The couple receiving the lowest combined total of judges' points and audience votes is eliminated each week until only the champion dance pair remains . </P> <P> Tom Bergeron has been the host since the program's premiere in 2005 . In season 1, his co-host was Lisa Canning . She was replaced by Samantha Harris for seasons 2 through 9 (2006--09), who was then replaced by Brooke Burke - Charvet from seasons 10 through 17 (2010--13). Erin Andrews took over as co-host starting in season 18 (2014). Drew Lachey served as a temporary replacement for Harris during season 5 (2007) during her absence for 3 weeks due to maternity leave . Leah Remini filled in for Andrews in week 6 of season 19, due to commitments with the 2014 World Series and filled in for her again in weeks 6 and 7 of season 21 for the 2015 World Series . Season 19 champion Alfonso Ribeiro filled in for Bergeron on week 4 of season 21, due to Bergeron's ailing father . </P> <P> The regular judges are Len Goodman, who serves as head judge, Carrie Ann Inaba, and Bruno Tonioli . Goodman was absent for much of season 19, all of season 21, and much of season 23 . Julianne Hough, who was a professional dancing partner for seasons 4--8, was added as a full - time judge on the panel for 3 seasons, 19--21, after having been a guest judge in the previous 2 seasons . She did not return for season 22 . Hough did return as a full - time judge for seasons 23 and 24 but did not return for season 25 . Several former contestants appeared as judges in episode 200 (in season 11), including Hélio Castroneves, Mel B, Drew Lachey, Gilles Marini, Kelly Osbourne, and Emmitt Smith . Other celebrities, most often those who are associated with the world of dancing, former professional dancers, and past contestants have appeared as the 4th judge or in absence of 1 of the main judges, including Paula Abdul, Donnie Burns, Nick Carter, Cher, Maksim Chmerkovskiy, Michael Flatley, Kevin Hart, Jessie J, Baz Luhrmann, Ricky Martin, Idina Menzel, Abby Lee Miller, Mandy Moore, Olivia Newton - John, Kenny Ortega, Donny Osmond, Pitbull, Redfoo, Alfonso Ribeiro, Robin Roberts, Shania Twain, and Zendaya . </P> <P> Color key: </P>

Who are the judges this year on dancing with the stars
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