Justin Bieber Gives Willow Smith a Healthy Dose of ‘More Cowbell’ (VIDEO)

Willow's Dreds!
Willow Smith debuts a green do.
'NSN' Clip!
Justin Bieber pulls another prank.
The Biebs Rocks O2
Justin Bieber performs at the famed stadium!
We all know by now that Justin Bieber takes his pranking seriously, so it should come as no surprise that he decided to have a little fun with the opener of his My World European tour opener, Willow Smith.

In the video posted on Ryan Seacrest’s website, the Biebs along with his manager Scooter Braun, hop on stage during a concert in the UK and turn their swag on with some silly wigs and Justin’s signature sound:

The cowbell!

Justin and co. also bust a couple moves in the hilarious video. Check it out above!

Which one of Justin’s pranks is your fave? “Firing” his gutarist on Twitter? Water ballon fight? Let us know by joining the convo on Facebook or tweet us @CELEBUZZ!