O'Neal grew some hair back for Michael Sembello's "Maniac."
The talk show host gave it all with her performance of Lady Gaga's "Poker Face."
The NBA star embraced his pop side with B-52's "Love Shack."
Tyler unleashed the athlete in her with Kurtis Blow's "Basketball."
The comedian won over the audience with his take on Bobby Brown's "Every Little Step."
The singer rocked out to KISS' "Rock and Roll All Nite."
Peters went back in time with his take on The Four Seasons' "December, 1963 (Oh, What a Night)."
The rapper got the audience on their feet with The Sugarhill Gang's "Rapper's Delight."
Peck had people shaking their butts with Sisqo's "Thong Song."
Only Milian could do justice to Jennifer Lopez's "Waiting for Tonight."
The Grandfathered star finally answered Justin Bieber's question: "What Do You Mean?"
The E! reality star crooned to Justin Bieber's "Baby."
The actor recreated a scene from Backstreet Boys' "Everybody (Backstreet's Back)" music video.
The actress' attitude was on point when she mimed En Vogue's "Free Your Mind."
Ricky Martin's "Livin' la Vida Loca" made Valderrama shake his hips.
The Jane the Virgin star went street for Lil Wayne's "A Milli."
The hip-hop artist transported the audience back to the '80s with New Edition's "Candy Girl."
DeAndre Jordan made a special appearance for Paul's cover of "Don't Stop Believin'" by Journey.
The rapper lit up performing "Could You Be Loved" by Bob Marley and the Wailers.
The NBA player selected his opponent's own hit, "Gin and Juice."
Björk's "It's Oh So Quiet" has never been so loud.
Rash took Pink's "So What" to new levels.
The former E! personality covered "I Bet My Life" by Imagine Dragons.
No one expected the actor to do En Vogue's "Something He Can Feel."