He may have gotten a haircut, but Justin Bieber proved that he can still whip it, surprising Willow Smith during her recent 'Whip My Hair' performance, PEOPLE reports.

Touring as the 'Baby, Baby, Baby' singer's opening act, Smith was performing her fame-making hit when Bieber and her brother, Jaden, appeared on stage to show off their own head banging skills. Video of the prank shows a surprised Smith, but the pro didn't miss a beat and continued with her routine.

The prank was all in good humor, and we've got a feeling that this isn't the first time Bieber tried to pull a fast one on Smith, who he calls his "little sis."