'Dancing with the Stars' 2015 results, winner prediction: New twist requires contenders to fuse two different dance styles

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The biggest dance-off for the 21st season of "Dancing With the Stars" will happen this week, and the top four celebrity contenders are busy working on their performances for the two-hour season finale on Tuesday.

According to the synopsis on ABC's official website, the season finale for the long-running dance reality competition will begin with an opening number that will be performed by all the 13 celebrity contestants of the season.

It will also showcase Kim Zolciak's samba performance to the tune of "I Dream of Jeannie," which she was not able to perform because of a mini-stroke, as well as the encore performances of all the eliminated contestants.

Then the first glimpse of the 90-minute "Dancing with the Stars: Live! Dance All Night Tour" winter tour will be shown, featuring Avicii's "Broken Arrows."

The synopsis also revealed that the last element of the season finale will require the competing couples to execute a new routine performance for the "24-Hour Fusion Challenge" where two completely different dance styles that they have already performed this season will be used. As an added twist to the challenge, the remaining contestants only have 24 hours to prepare for the said routine.

The celebrity contestant and his/her pro dancing partner with the highest score will be hailed as the Mirror Ball champion of "Dancing With the Stars" season 21.

Out of the four remaining contenders, Orlando Sentinel reported that Steve Irwin's 17-year-old daughter Bindi has been consistently strong this season. She was also described as the best dancer remaining in "Dancing with the Stars" season 21, since actor Carlos PenaVega and Backstreet Boys member Nick Carter showed several weak performances in the previous weeks.

Meanwhile, celebrated soldier and Legion of Honor awardee Alek Skarlatos is surprisingly a good contender this season, but Bindi still has an edge over the three gentlemen because of her exceptional star power.

Will the Australian beauty beat the men in "Dancing with the Stars" season 21?

The season 21 finale airs Tuesday, Nov. 24, on ABC.