Early this morning, Justin Bieber was arrested for DUI. 

 

According to TMZ,

Bieber was busted in Miami Beach for both DUI and drag racing.

The arrest occurred early Thursday morning. 

Bieber is now in custody and is at the police department where he is being tested -- presumably to more precisely measure his blood alcohol level.  Our law enforcement sources say Justin was given a field sobriety test at the scene ... and failed.

His next stop will be jail, where he will be booked and processed and bail will be set.

We're told Bieber had just left a club and was driving a yellow Lamborghini at the time cops spotted him in a residential neighborhood.  Sources say the person Justin was racing was also arrested -- he was in a red Lambo.