Campbell reversed an earlier plea of innocent when he appeared Monday in a Maricopa County, Ariz., superior court for the Nov. 24 incident, E! Online reported Tuesday. Prosecutors dropped an assault charge in exchange for the guilty plea.
The Grammy-winning singer is due back in court June 14 for formal sentencing, which likely will involve 10 days behind bars, E! Online said, with eligibility for a work-release program after two days, then 75 hours of community service work.
Campbell tested 0.2 percent on the Breathalyzer when he was caught near his home after the accident, which is twice Arizona's legal limit of 0.08. He blamed the situation on mixing prescription drugs and liquor.
Campbell has sold more than 40 million records, scoring 27 Top 10 hits throughout his 40-year career. He also hosted TV's "Glen Campbell Goodtime Hour" on CBS from 1969 to 1972.