Disney star Milo Manheim and his partner, Witney Carson, will be partnering with R5 singer and Glee alum Riker Lynch, who came in second alongside pro partner Allison Holker during season 20.
Instagram star Alexis Ren and her partner, Alan Bersten, will be teaming up with dancer Maddie Ziegler, who has never competed on the show but has appeared several times for special performances.
For "Grocery Store Joe" Amabile's dance with his partner, Jenna Johnson, they will be joined by Joe's fellow Bachelor in Paradise star, Jordan Kimball.
Olympic icon Mary Lou Retton and her partner, Sasha Farber, are getting help from a fellow Olympian and DWTS vet, Nastia Liukin, who came just short of the finals with partner Derek Hough in season 20.
Radio host Bobby Bones and his patient, gracious pro partner, Sharna Burgess, will be teaming up with musician and season 25 runner-up Lindsey Stirling.
Fuller House star Juan Pablo di Pace and his partner, Cheryl Burke -- who earned this season's first perfect score on Monday -- will be finding their trio partner in the talented Melissa Rycroft. The former cheerleader and TV personality previously came in third place on DWTS season eight in 2009, and later competed again during the "All-Stars" season.
Dukes of Hazzard star John Schneider and partner Emma Slater will be hitting the floor with NSYNC's Joey Fatone for their trio dance. Fatone, who came in second place during season four with partner Kym Johnson, has been a close friend to Slater for some time, and the dancer told ET that he even sang at her wedding!
Singer Tinashe and her partner, first-time pro Brandon Armstrong, will be getting a little help during trio week from Paralympian and season 18 runner-up Amy Purdy.
And finally, for Harry Potter star Evanna Lynch's trio dance with partner Keo Motsepe, the actress turned to one of her former co-stars, Scarlett Byrne, who played Pansy Parkinson in the beloved film series.
Dancing With the Stars Trio Week kicks off Monday at 8 p.m. ET/PT on ABC.