Britney Spears spent 45 minutes at the police station

The 25-year-old singer spent about 30 minutes at the station on Monday evening, after a judge ordered her to submit to the procedures.

Ms Spears was charged last month for allegedly crashing into a parked car while driving without a valid licence.

She could face up to six months in jail for the 6 August incident.

A conviction will also carry a fine of $1,000 (�490).

Ms Spears' first court appearance is scheduled for 25 October.

Personal life

Officer Mike Lopez said Ms Spears, who applied for a California licence earlier this month, was fingerprinted and photographed before leaving, about 45 minutes after having turned herself in.

"She was fine, cooperative, Lopez said. "She did her business and came out."

Ms Spears' career and personal life has recently been beset by a series of incidents.

Last week, a judge granted her permission to spend one night a week with her two young after the singer lost full-time custody to former husband Kevin Federline.

Ms Spears and Mr Federline must appear at a further hearing on 26 October.

Last month, a judge said Ms Spears showed "a habitual, frequent and continuous use of controlled substances and alcohol".

She was then ordered to complete random drug and alcohol tests twice a week, as well as meeting weekly with a "parenting coach", according to court documents.

But she later lost custody after failing to produce her driving licence and missing a test for drugs and alcohol.