7 celebrity look-alikes that made us do a double-take

In honor of Look-Alike Day, we round up some of our favorite doppelgängers.

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Will Ferrell/Chad Smith

Will Ferrell (left) is one of the unique talents in Hollywood today. The California-born comedian became famous for his work on "Saturday Night Live" and went on to make a name for himself as a movie star and, as co-founder of the website Funny or Die, a viral sensation. But despite his fame, people still sometimes confuse him for someone else: Chad Smith (right), the drummer for the Red Hot Chili Peppers. To settle who's who once and for all, the two appeared together on "The Tonight Show" with Jimmy Fallon for an epic drum-off.

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