Pop sensation Justin Bieber has clarified that he is not gay after he posted a video of kissing a male friend on the cheek.

Bieber, 21, assured his fans that he is "not gay", reported MTV online.

The video, seemingly taken on a private plane, shows the "Baby" crooner messing around on a scooter-type device with no handlebars.

He smiles as he spins around and then leans down to plant a peck on the cheek of a male close friend.

Bieber then glides over towards the camera with a big grin on his face and does a little jump in the air.

"I’m not gay but even if I was that’s not an insult," the 21-year-old captioned the video.