Christina Aguilera & Jimmy Fallon Perform in Disguise in NYC Subway Terminal - Watch!

Christina Aguilera and Jimmy Fallon are so sneaky!

The “Fall In Line” powerhouse singer and the late night TV host dressed up in costumes to perform unannounced on Wednesday (June 13) in the Rockefeller Center subway terminal in New York City.

PHOTOS: Check out the latest pics of Christina Aguilera

The two performed several songs, including George Michael‘s “Freedom! ’90″ and Christina‘s own “Fighter.” And between the silly costumes and Christina‘s immediately recognizable voice, the crowd clearly knew who it was singing the songs – and they loved it!

Christina‘s new album Liberation is out now – and you can listen to it here!

FYI: Christina is wearing a Royal Workshop jacket.