Watch Justin Bieber Bash Head on Revolving Door

That had to hurt!

Justin Bieber, 16, walked into a revolving door while exiting a Radisson Hotel. Watch above.

PHOTOS: How these kid stars have changed

"Yo, what up, I just walked into that door," Bieber says to the videographer who caught his mishap on tape. "My forehead hurts. What happened was, I thought it opened, but obviously it didn't, and I walked right into the window."