Lamar Odom -- Arrested for DUI

11:07 AM PT -- TMZ has just obtained a photo of Lamar's Mercedes SUV inside the tow yard, where his car was taken after the DUI arrest.

10:05 AM PT -- According to the L.A. County Sheriff's Dept., Odom was released from custody at 8:33 AM. However, it's unclear if Odom has actually left the station yet.

9:17 AM PT -- Law enforcement sources tell TMZ ... officers at the scene smelled alcohol on Lamar and believe he was under the influence of both drugs and alcohol. The sources say Lamar's driving and conduct were consistent with drugs. We're told there were no drugs or alcohol found in Lamar's car ... only cigarettes, 2 bottles of cologne and other innocuous items.

Lamar Odom was arrested for "driving under the influence of alcohol and/or drugs" early Friday morning ... TMZ has learned.

The bust occurred in the San Fernando Valley at 3:54 AM. Lamar -- who was driving a white Mercedes SUV -- was popped by the California Highway Patrol and taken to a nearby station, where he was booked and is being held on $15,000 bail.

He was pulled over on the 101 Freeway for going too slow -- 50 MPH. Cops say Odom had been driving in a "serpentine manner."

Lamar initially did not respond to cops, and drove 3 exits before finally coming to a stop. Law enforcement sources tell TMZ he showed obvious signs of intoxication.

Lamar failed numerous field sobriety tests.

When Lamar was booked, we're told he refused all chemical tests.

Lamar's booking sheet shows he is 6'10" and 235 lbs.

Lamar has been tooling around town lately ... this after TMZ broke the story he had been on a crack binge.