Heather Locklear Arrested

Heather Locklear was arrested on suspicion of driving under the influence Saturday evening in Santa Barbara County, Calif. "Around 4:30 p.m., a female witness saw Heather Locklear driving erratically while leaving a parking lot in Montecito," California Highway Patrol spokesman Tom Marshall tells PEOPLE. "The witness said Locklear was revving her engine loudly, and backed over a pair of sunglasses several times." Soon after, the witness – who apparently didn't recognize the actress – spotted Locklear, 47, stopped on a nearby highway, exiting her vehicle. "The witness called 911 because she was concerned for Locklear's safety," Marshall said. "When a CHP officer arrived, Locklear was found seated inside her vehicle, which was partially blocking the roadway." Because Locklear appeared "disoriented and impaired," she was taken to a local CHP station and drug and alcohol tests were administered, Marshall said. The actress was cooperative.