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Justin Bieber Surprises Fans; Singer Shocks Fan Backstage During TLC Special (VIDEO)

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Justin Bieber gave two fans the shock of their lives while filming his TLC documentary "This Is Justin Bieber."

Entertainment Tonight offers a look at the promo for the documentary, airing Wednesday December 21st, showing the two young girls freak out when their idol enters the room they are waiting in.

The 17-year-old pop prince surprised his "beliebers" with tickets to his concert and the TV appearance he was making while in the UK. This behind the scenes look at a day in the life of Justin Bieber shows the exhausting lifestyle he leads and offers some exclusive performances from him Christmas album, "Under The Mistletoe."

Surprising fans is becoming a regular habit for Bieber. Earlier this month he staged a private concert for Whitney Elementary, a low-income Las Vegas area school that was highlighted on "The Ellen Degeneres Show" in September. Bieber gave the school a $100,000 donation, which was then matched by the retailer Target, and gave the 650 students a private concert.

Looks like someone is definitely in the holiday spirit!

Check out some shots of Bieber's London performance below!

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