Locklear pictured above in her police mugshot.

Just in: ET has obtained audio of the 911 call made by a citizen who allegedly witnessed Heather Locklear driving erratically Saturday afternoon just prior to her DUI arrest. Click here to listen to the call.

A spokesperson for the California Highway Patrol confirmed to ET that the 911 caller observed a woman, alleged to be Locklear, acting strangely and driving poorly as she left a parking lot in Montecito, California -- an upscale town adjacent to Santa Barbara.

Locklear was booked at 7 p.m. Saturday on suspicion of driving under the influence of a controlled substance and was later released from custody.

Representatives for the star declined comment but have referred ET to Locklear's attorney.