Justin Bieber is a child no more. The pop star celebrated his 17th birthday yesterday, and he did his fair share of showing the paparazzi who's boss. Bieber gave photographers the middle finger as he and his rumored, but obviously no longer a rumor, girlfriend Selena Gomez were leaving Maggiano's restaurant after his birthday dinner.

Has our favorite teeny-bopper gone all "Charlie Sheen" on us? Doubtful. It just looks like the normally well-mannered singing sensation may have just had enough of the paparazzi following his every move. He and Gomez were mobbed earlier in the day while out shopping.

Check out some other stars who decided to use hand gestures instead of words after the jump!