'Dancing with the Stars' 2015 season 21 finale: what to expect

 Dancing with the Stars/Facebook

Four couples head to the "Dancing with the Stars" season 21 finale and by the end of Tuesday, a new winner will be crowned among Alek Skarlatos and Lindsay Arnold, Bindi Irwin and Derek Hough, Carlos PenaVega and Witney Carson and Nick Carter and Sharna Burgess.

Before one of them gets to the coveted Mirror Ball Trophy, the pairs will have to do two routines. In the first one, the judges will be of assistance with Carrie Ann Inaba lending a hand to both Bindi and Alek, Bruno Tonioli assisting Carlos and Julianne Hough working with Nick.

The second routine the contestants will prepare for the "Dancing with the Stars" season 21 finale is Freestyle. In usual "DWTS" fashion, the performances will be littered with extra dancers, special effects and random surprises and the pairs must be able to connive with all that beautifully.

Before the first part of the finale ends, Meghan Trainor and Ariana Grande will take center stage to sing their hit single "Boys Like You" and "Like I'm Gonna Lose You." By the end of the festivities, one couple will be sent home.

Gold Derby believes that Alek is on the brink of getting eliminated but TV Guide says that it will only take one shocker of a performance for him to further get noticed. The said site also thinks Nick is the frontrunner of the contest.

Meanwhile, Orlando Sentinel believes that Bindi has it all in the bag. She has the appeal and the charm. As far as dancing go, she is believed to be the most consistent so it wouldn't be surprising if "Dancing with the Stars" season 21 ends with her as the winner of the Mirror Ball trophy.

Come Tuesday, three couples move on to impress the judges for the last time with a nice combination of two dance routines in the infamous 24-hour fusion challenge. There will be far more performances from stars on this day as well.

The show will rock the Grove shopping center where Alexander Jean and "Dancing with the Stars" season 21 contestants Andy Grammer, Chaka Khan, Elle King and Nick Carter perform. Kim Zolciak will hit the dance floor once again with Tony Dolovani to dance to "I Dream of Jeannie," a routine they never got to perform after she left the show for health issues.

"Dancing with the Stars" season 21 finale will air Monday, Nov.23 at 8 p.m. and Tuesday, Nov. 24 at 9 p.m. on ABC.

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