Justin Bieber video shows singer 'stumbling' around in jail following DUI arrest

Video footage has emerged of Justin Bieber which appears to show the pop singer struggling to walk in a straight line following his drunk driving arrest last month.

The film, released by Miami-Dade County prosecutors after it was sought under Florida's public records law, shows the 19-year-old star stumbled slightly while trying to prove he was sober.

The nine hours of surveillance footage also shows Bieber spent some of his time in jail doing push-ups, before being charged with driving under the influence (DUI), driving with an expired licence and resisting arrest.

A law enforcement source told gossip website TMZ.com that some of the nine hours of video surveillance show Bieber, who was filmed wavering as he tried to walk heel to toe on white line and reaching his arms out to steady himself, was under the influence at the time, even though his blood alcohol level was barely measurable at .014 and he did 23 push-ups in 28 seconds before he was released on bail.

The singer's lawyers persuaded the judge overseeing the case not to release four clips that show Bieber in "various states of undress, which show personal parts," captured while he was giving a urine sample.

A source, who saw the footage, said: "Justin is seen several times stumbling around while he was taking his tests. As if he had a problem with his balance ... [the video] also shows Justin taking his various tests and eventually taking a p**s.

Bieber is set to appear in court in Miami next Monday, after reportedly rejecting a plea deal that required him to submit to random drug testing for up to nine months and complete 40 hours of community service.