Justin Bieber was left red-faced during a show in Florida this week (ends11Aug13) as his low-slung pants started falling down during an energetic dance routine.

The 19-year-old pop star was performing in Jacksonville, Florida on Wednesday (07Aug13) wearing a pair of bright red leather trousers and no shirt, when his pants began dropping down to his knees.

In video footage from the concert, Bieber can be seen awkwardly trying up to pull up his pants, which left his black boxer shorts and his butt on display, and at one point, he has to hold on to them throughout a dance routine to stop them sliding to the floor.