We love it when talk show host Jimmy Fallon surprises jaded New Yorkers with a superstar song session for ‘NYC Subway Busking’ segment. Last week a disguised Christina Aguilera joined Fallon for a rousing version of her hit ‘Fighter’ and as an encore, Arthea Franklin’s ‘Think’ in a New York subway stop. A crowd gathered without even recognizing the singer, drawn in by her powerful voice. Watch the surprised look on the crowd when she reveals herself.

The singer is promoting the release of her new album, ‘Liberation.’ Watch and enjoy.