Gabrielle Union Goes Back to High School With Jimmy Fallon (Video)

Dwayne Johnson took rival contestant Jimmy Fallon's trash-talking and decided to "Shake It Off" with Taylor Swift, before bringing out the bellbottoms for the Bee Gees' "Stayin' Alive."

Common went all out with "I Want You Back" by Jackson 5 and ended even higher with Lionel Ritchie's "All Night Long."

John Legend busted out Juvenile's "Slow Motion" before dusting off the Hammer pants for "U Can't Touch This."

Anne Hathaway gave the crowd a little "Love" from Mary J. Blige before bowling the audience over with Miley Cyrus' "Wrecking Ball."

Emily Blunt showed her hip-hop roots with Blackstreet's "No Diggity" before nailing an insane Janis Joplin impression for "Piece of My Heart."

Anna Kendrick revealed a secret love for Emily Blunt with One Direction's "Steal My Girl," before enlisting Jennifer Lopez's help with "Booty."

John Krasinski showed off his sick marionette skills for N*Sync's "Bye Bye Bye," then revealed his sexy side by dancing in a glittery dress for Tina Turner's "Proud Mary."

Mike Tyson gives the audience "Satisfaction" courtesy of the Rolling Stones before (kind of) busting out Salt n' Pepa's "Push It."

Terry Crews unleashed his masculinity with Run-DMC's classic "Sucker M.C.'s" before revealing his softer, more feminine side with Vanessa Carlton's "A Thousand Miles."