Heather Locklear was arrested on suspicion of driving under the influence Saturday, according to People magazine. Apparently there are lower places you can sink to beyond dating David Spade.

The actress -- who underwent treatment for anxiety and depression two months ago -- allegedly drove under the influence of prescription medication and was spotted by a witness driving irregularly.

California Highway Patrol spokesman Tom Marshall told People. "Around 4:30 p.m., a female witness saw Heather Locklear driving erratically while leaving a parking lot in Montecito. The witness said Locklear was revving her engine loudly, and backed over a pair of sunglasses several times."

The witness then spotted Locklear on the highway, leaving her vehicle, appearing “disoriented and imapaired.”

"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."

According to Marshall, the police took Locklear to a local CHP station, where drug and alcohol tests were given.

"Alcohol was ruled out as a factor, but based on the officer's observations, we believe Locklear was under the influence of prescription medication," Marshall said.

Locklear was then arrested on suspicion of DUI and being under the influence of a controlled substance. She was booked at a local jail and released hours later.

There has been no comment from Locklear or her representatives.

© (c) CanWest MediaWorks Publications Inc.