Justin Bieber and Friends Help Light Rockefeller Center Christmas Tree

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Let's face it: this is Justin Bieber's world. We merely live in it.

The superstar has been everywhere this holiday season, and not solely because some moron named Mariah Yeater sued him for paternity of her son. Bieber has released a Christmas CD and has spent weeks promoting it via talk shows, live performances and official video releases. The latest example of the latter? This duet with Mariah Carey.

So it's only appropriate that Bieber - along with friends Usher and Busta Rhymes - was featured on last night's tree lighting ceremony at Rockefeller Center in New York City. Watch the teenage icon do his thing in the following two performance videos:

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