Christina and Jimmy ripped it up in a New York Subway. The prank segment aired on The Tonight Show With Jimmy Fallon Thursday night. The did an acoustic version of Aretha Franklin’s THINK. Once they revealed who they really were, the sang Christina’s 2004 hit FIGHTER.
LOS ANGELES, CA - JULY 21: Singer Christina Aguilera watches the game between the Atlanta Braves and the Los Angeles Dodgers at Dodger Stadium on July 21, 2017 in Los Angeles, California. (Photo by Harry How/Getty Images)