Law enforcement sources tell TMZ at around 4 AM, someone heard a crash near North Ranch Country Club in Westlake Village, CA. The person who heard the crash didn't call the Ventura County Sheriff's Department until 7:48 PM that night. Deputies went out to the area and found a knocked over "no parking" sign and obvious signs of a car that went up the curb, striking the sign. 

Deputies confirmed through investigation that the car in question was Locklear's black BMW. The collision was very close to Locklear's home. Deputies then went to Locklear's home, saw damage to the BMW that was consistent with the collision, and arrested her for hit-and-run.

The offense is a misdemeanor, so Locklear was not taken into custody -- just cited and released. An official from the Ventura County Sheriff's Department tells TMZ a hit-and-run citation constitutes an "arrest."