JUSTIN Bieber 0, Revolving Door 1.

In a hilarious new video, (a later, highly embarrassed) Justin Bieber is filmed leaving a building through a revolving door, only to slam his forehead on the glass as he attempts to make his exit.

The singer moans about bumping his forehead to his minders, and quickly turns sheepish when he spots paparazzi cameras rolling.

After being ushered to his vehicle, the star speaks to the camera crew, expressing the stab to his ego as best as a 16-year-old can.

Watch a video of the mishap here:

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