Canadian sensation Justin Bieber has been slammed for supposedly lip-syncing during a recent concert at the Prudential Centre in Newark.

His New Jersey performance left critics with bad tastes in their respective mouths and the event attracted a handful of negative reviews with Mesfin Fekadu of The AP describing his set as 'sluggish' and 'lazy'. Fekadu wrote:

"He seemed to be lip-syncing and his sluggish, lazy dancing didn't match the oomph of the beats. Bieber phoned in a good amount during his show; at some moments, he even appeared bored. He was clocking in – another day, another sold-out concert. He was lip-syncing again… During 'She Don't Like the Lights', Bieber barely moved to the track's futuristic beat (maybe it was the leather tights?)."

Local newspaper Asbury Park Press also gave a poor review of the gig and journalist Chris Jordan explained:

"As for Bieber the performer, well, there's not a whole lot to believe in. His voice is thin and reedy. Unfortunately, his dancing isn't any better than his singing. His turns are loose and his body control is sloppy. He seemed divided as to whether he should join his team of dancers full force or just let them do most of the work."