Three Too Many? Joyce DeWitt Busted for DUI

TMZ has learned "Three's Company" star Joyce DeWitt was arrested for DUI on July 4th in El Segundo, California.

Law enforcement sources tell us DeWitt drove past a barricade Saturday afternoon -- and when an officer approached her, she smelled like booze. She was given field sobriety tests and then arrested for suspicion of DUI.

The 60-year-old actress, who played Janet Wood on the 80's sitcom, posted bail for $5,000.

The Regal Beagle wouldn't comment.