Justin Bieber, Six-Pack Perform on New Year's Eve >>Hollywood

Oops, he did it again, folks.

Justin Bieber performed last night in Times Square, taking the famous New Year's Eve stage and revealing his slick six-pack for the world to see.

Yes, it was another Justin Bieber shirtless show for fans, as the artist belted out a version of "As Long As You Love Me" (with Big Sean) and also went acoustic for "Boyfriend."

Watch both now:

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  Justin Bieber New Year's Eve Performance (Ft. Big Sean)
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  Justin Bieber - "Boyfriend" (Acoustic)

Among other New Year's Eve highlights:

• Hammer and Psy went Gangnam Style.