Justin Bieber has been branded ''stupid'' for holding on to a moving van while out skateboarding.

The 20-year-old pop star stunned fans by posting a video on Instagram of him riding down a busy road in Beverly Hills, Los Angeles, while grabbing onto the door of his blacked-out vehicle.

He's seen in the video wearing low-waisted trousers, sunglasses, a hooded jacket and boots and captioned it: ''Ridin down fairfax lol had a great time (sic)'', but some fans were less than impressed with his irresponsible actions.

One follower wrote underneath the video: ''JUSTIN. Please be careful, this looks SO dangerous!! (sic)'', while another added: ''This is stupid. lol. You could get hurt J. (sic)''

Meanwhile, the star later posted a photograph of him relaxing in a cinema night with his friends as rumours continue to swirl about his love life and relationship with ex-girlfriend Selena Gomez, who sources say he still has feelings for.

An insider said: ''Selena treated him like a regular person but all of these other girls treat him like a God and let him do whatever. I think they make Justin feel like he's in control and calling the shots.''

Selena, 21, and Justin were last spotted at Coachella Valley Music and Arts Festival last month in California but have since had a ''huge fight'' and he has been linked to a number of beauties, including Selena's friend Kylie Jenner and model Yovanna Ventura.