Imagine going down to your NYC subway station and seeing Christina Aguilera and Jimmy Fallon! Well you may not recognize them at first because they were in disguise. I love when Jimmy does this bit where they perform in the subway in disguise, it's hilarious watching the people observing them!
The duo sang Aretha Franklin's "Think" along with Christina's song "Fighter." Christina's voice is soooo unmistakable it's no surprise people caught on. PS - Christina's new album Liberation is out today!