'DWTS' Week 6 Preview: Nick Viall Promises Charming Boy Band Team Dance, Maksim Chmerkovskiy Returns & More!

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The competition has been heating up on Dancing With the Stars, and it's about to get even hotter!

The season 24 celebrities and their pro partners will be dancing to iconic songs from boy bands and girl groups, right in front of a guest judge who knows a thing or two about how to succeed in the ballroom.

Ahead of Monday's highly anticipated show, airing at 8 p.m. ET on ABC, we're breaking down everything you need to know about week six.

WATCH: 'Dancing With the Stars' Week 5 Dance Recap: Best Lifts, Kicks, Tricks and Flips!

Who's on top of the leaderboard?

1. Normani Kordei & Val Chmerkovskiy: 39/40
2. Simone Biles & Sasha Farber: 38/40
3. Nancy Kerrigan & Artem Chigvintsev: 36/40

Who's in danger of elimination?

Although the fans voted them safe, David Ross and Lindsay Arnold received the lowest scores from the judges last week (29/40), followed closely behind by Bonner Bolton and Sharna Burgess, who were also safe, but received 30 points. Will one of the pairs face elimination this time around, or will it be Nick Viall and Peta Murgatroyd, who have been in the bottom two for the past two weeks?

There will be a boy band-themed team dance, and Nick Viall is really looking forward to it.

ET caught up with the former Bachelor and his fiancée, Vanessa Grimaldi, at the Guardians of the Galaxy Vol. 2 premiere in Los Angeles last week, where they opened up about how rehearsals have been going ahead of Viall's sixth week on the show.

"I think he's doing great, he's practicing really hard," Grimaldi revealed. "Peta [Murgatroyd]'s a great partner, so I'm really proud of him."

"I thought dancing hours were going to be a lot longer, so I find it's more like a 9-5 job," she added, when asked if competing on the show has affected their relationship. "He's out of the house, I'm working on my foundation, so we're both pretty busy, but we make time for each other, and at the end of the day, that's what counts."

Viall and Murgatroyd, aka #TeamBabyGotBach, will be dancing the jive to "Fun, Fun, Fun" by The Beach Boys. And while we're majorly stoked to see what moves they'll pull off in their routine this week, after speaking with Viall, we're even more excited for the team dances.

"We have a really great team name, I personally think," Viall teased of the boy band-themed piece he'll be dancing with remaining male contestants Rashad Jennings, Bonner Bolton and David Ross. "It was collaboration. It was basically our initials, but in a very clever way. It's funny."

"I'm looking forward to it," he continued. "I mean, listen, I think the guys know that the women are far superior in talent than the guys, but we're going to try to win with charisma and entertainment value. You've got a pop star, a pro dancer, two Olympians versus a reality TV reject, retired baseball player and a running back."

Viall also told ET it's going to be "all charm from the guys," and viewers at home can "100 percent" expect to see them with their shirts off.

"We're going to use everything in our arsenal," he exclaimed. "We'll try our best. I'm excited."

Dancing With the Stars
alum Nick Carter will be a guest judge this week.

What would a boy band-themed night be without a member of the Backstreet Boys in the house? Carter will be helping judges Carrie Ann Inaba, Bruno Tonioli, Julianne Hough and Len Goodman critique the remaining eight couples.

And seeing as he placed second in the show's 21st season with Bonner Bolton's current partner, Sharna Burgess, we have a feeling he won't go too easy on the celebrities. But #TeamDenimNDiamonds is really going to have to step up their game this week if they want to impress Carter -- the two are dancing a rumba to one of the Backstreet Boys' most famous hits, "I Want It That Way."

Normani Kordei is attempting an advanced move this week.

We've seen her amazing high kicks and a few beautiful spins in the ballroom, but the Fifth Harmony star is taking it to a whole new level on Monday! When ET caught up with her at Marie Claire's Fresh Faces party in West Hollywood, California, last Friday, she told us her pro partner, Val Chmerkovskiy, has taught her a new trick for their salsa to "When I Grow Up" by The Pussycat Dolls.

"There's a lift, and I'm scared," she revealed. "But it will be great if I get it!"

Well, if her previous performances are any indication of her dance skills, we have no doubt she'll SLAY!

Maksim Chmerkovskiy is back!

After suffering a calf surgery that caused him to sit out of the competition for four weeks, the 37-year-old dancer will finally be back and dancing a rumba to TLC's "Waterfalls" with Heather Morris in the ballroom on Monday.

ET recently caught up with troupe dancer Alan Bersten, who filled in as Morris' pro partner while Chmerkovskiy was out, who teased what will happen as the fan-favorite dancer returns.

"I mean, obviously I knew in advance he was coming back," he said. "It wasn't a shock to me, but I was sad, you know? [Heather and I] spent four weeks together, half the season's gone, like, time flew by."

"I know that his range and mobility is much better," he added. "I remember two weeks ago he started walking, so it's crazy that after two weeks he's able to dance again, and push off and jump. We'll see how this week goes."

So what does Bersten think #TeamMaksimumHeat needs to do in order to stay in the competition and make the DWTS finals?

"Heather really opened up her personality, and I also think she's more comfortable with the show," he continued. "I think Maks knows exactly what needs to be done. He's not a newbie, he's a veteran -- he's a mirror ball champion -- he knows exactly what needs to be done."

Simone Biles is channeling her inner Beyoncé.

The Olympic gymnast and her pro partner, Sasha Farber, will be performing a samba to "Survivor" by Destiny's Child. Judging from the insane lifts, flips and tricks #TeamGoldenGiggles executed last week, we can only imagine what they'll pull off this week. One things for sure, we can expect major fierceness from the 20-year-old athlete!

What are the other stars dancing to?

David Ross & Lindsay Arnold

Argentine Tango, "I Want You Back" by *NSYNC

Nancy Kerrigan & Artem Chigvintsev

Paso Doblé, "Free Your Mind" by En Vogue

Rashad Jennings & Emma Slater

Tango, "Reach Out, I'll Be There" by The Four Tops

Social media teases.

Below, see more of the best moments the stars have shared over Twitter and Instagram as they gear up to take the stage to perform again on Monday:

Which pair are YOU most excited to see hit the ballroom during week six? Let me know on Twitter (@desireemurphy_ ) or in the comments section on our official Facebook page! And be sure to follow all of our DWTS coverage all season long, right here on ETonline.com.