Singer hits his head on glass

Justin Bieber was left red-faced after mistaking a plate of glass for a door – for the second time this month.

The singer had his head down as he tried to leave a building recently and instead of heading through the exit, head-butted a glass frame.

The 16-year-old was not seriously hurt but he needs to start paying more attention to where he’s going! Or perhaps he just needs his eyes tested…

Earlier this month, Justin, 16, banged his head when he walked into a revolving door while leaving a Radisson Hotel in Germany.

SEE VIDEO Justin Bieber walks into glass door…

SEE VIDEO Justin Bieber walks into revolving door…

SEE PICTURES The top 20 teen idols>

SEE PICTURES Justin Bieber gets mobbed at airport>>

SEE PICTURES Justin Bieber bungee jumps off bridge>>