'Dancing With the Stars' Week Three Preview: Derek Hough Returns, Celebrities Go Shirtless and More!

Monday is Vegas Night on Dancing With the Stars!

In order to stay in the competition, the remaining contestants and their pro partners will have to step up their game by working on their technique and including new choreography surprises in their casino-themed routines.

So, who will get lucky and who will be sent home? ET breaks down everything you need to know ahead of week three of the competition.

WATCH: Sharna Burgess and Bonner Bolton Talk Exhausting 'DWTS' Rehearsals: 'She's Working Me Hard'

Who's on top of the leaderboard?

1. A tie for first! Rashad Jennings and Emma Slater & Normani Kordei and Val Chmerkovskiy: 32/40
2. Heather Morris and Maksim Chmerkovskiy: 30/40
3. Sharna Burgess and Bonner Bolton: 29/40

Who's in danger of elimination?

Mr. T and Kym Herjavec received the lowest score from the judges -- 22/40 -- last Monday, followed closely behind by Nick Viall and Peta Murgatroyd, who received a score of 25, and Charo and Keo Motsepe, who scored a total of 26 points.

After last week's show, in which Charo had a heated reaction after listening to critiques from the judges, rumors began to swirl that she was threatening to quit the competition. The flamenco guitarist and dancer later took to Instagram to inform #TeamCuchiCuchi fans that she was not bowing out, and hopes to "stay awhile."

Derek Hough is making a special appearance.

The former Dancing With the Stars pro will be taking the stage with his sister, Julianne, on Monday to perform a piece from their upcoming Move Beyond -- Live on Tour, which kicks off April 19.

When ET asked Julianne how she's balancing touring across the nation with DWTS, she joked most of her sleeping will be done on the plane.

"Schedule-wise, I'm going to be sleeping a lot, as much as I can, but I'll be coming back every Monday [to judge]," she explained. "It's going to be fun, I'm excited."

Maksim Chmerkovskiy is still out of the competition.

Poor Maks! The 37-year-old dancer, who is partnered with Heather Morris this season, confirmed via social media that he will be out for another week following a calf injury that occurred while the two were rehearsing for their week two dance.

A source told ET that Maks tore his calf muscle "pretty badly," and is currently undergoing physical therapy. "It's a lot worse than everyone initially thought," the source said. "Doctors are insisting that Maks sit out for at least a month, but knowing Maks, he will try and rush it and get back into the competition."

Alan Bersten will once again fill in as Heather's partner on Monday. The two will be dancing a tango to "Toxic" by Britney Spears.

Expect some steamy moments from athletes Rashad Jennings and David Ross' performances.

Will this be the week we finally see Rashad shirtless? While chatting with ET last week, he confirmed there will be a point when he gives fans a glimpse of his abs. "Yeah, [the shirt] will definitely be coming off at some point," he teased, laughing.

The NFL pro and his partner, Emma Slater, will be taking on the samba to Jason Derulo's "Swalla," feat. Nicki Minaj and Ty Dolla $ign, and if they pull any inspiration from the track's official music video, things are bound to get spicy in the ballroom.

"Just wait," Emma told ET. "The response on social media is amazing, too. [The fans] are always like, 'Oh, Rashad. Take your shirt off!'"

Another routine we're anticipating to be extra sexy? David Ross and Lindsay Arnold's jazz dance. The two will be busting out their best moves to "Candy Shop" by 50 Cent feat. Olivia. We don't think that song needs any extra explanation...

In case you forgot what that music video looks like, watch below:

Nick Viall wants to make up for his performance from last week.

This week, #TeamBabyGotBach will be dancing the tango to Lady Gaga's "Poker Face," and the former Bachelor star hopes to wow the crowd, as well as his partner, Peta Murgatroyd.

"It cut me at my core," he said of receiving a low score of five from judge Len Goodman during last week's show. "It hurt. The truth is, I felt really bad, just because I think some of the feedback we got from the judges was even directed at Peta for almost, like, making the choreography too difficult. But, the truth is, it wasn't like she has amazing [difficult] choreography."

"I just kind of choked in the middle," he admitted. "Because she's doing such a great job, and [the judges] kind of put the pressure on her, and it was up to me to deliver, and so, seriously, it felt like... I feel like I let her down. She's a pro. She's amazing. She also just had a baby, she's a mom, she's killing it, and all I had to do was a simple step, and I didn't do it."

What are the other couples dancing to?

Simone Biles & Sasha Farber
Quickstep, "Viva Las Vegas" by Elvis Presley

Bonner Bolton & Sharna Burgess
Charleston, "A Little Party Never Killed Nobody" by Fergie, GoonRock and Q-Tip

Charo & Keo Motsepe
Foxtrot, "Chapel of Love" by The Dixie Cups

Erika Jayne & Gleb Savchenko
Jive, "Take Me to Heaven" by Patina Miller, Debbie Kurup and Amy Booth-Steel

Nancy Kerrigan & Artem Chigvintsev
Samba, "Shake Your Bon-Bon" by Ricky Martin

Normani Kordei & Val Chmerkovskiy
Foxtrot, "Big Spender" by Shirley Bassey

Mr. T & Kym Herjavec
Foxtrot, "Ain't That a Kick in the Head" by Robbie Williams

Social media highlights.

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 three? 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.

WATCH: 'Dancing With the Stars' Week 2 Dance Recap: Best Lifts, Kicks, Tricks and Flips!

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