Eddie Cibrian's Ex I Didn't Drive Drunk!

1/20/2011 10:21 AM PST

Eddie Cibrian's Ex Brandi Glanville DUI -- I Didn't Drive Drunk!

Brandi Glanville -- Eddie Cibrian's ex-wife -- just pled not guilty to DUI stemming from her October arrest ... TMZ has learned.

Glanville's attorney just appeared at the Beverly Hills courthouse to cop a plea to two misdemeanor charges -- driving under the influence of drugs or alcohol and driving with a blood alcohol level of above .08.

As TMZ first reported, Glanville was pulled over on Sunset Blvd. just after midnight on October 29.

If convicted, she could face 6 months behind bars and a $1,000 fine.