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