Brittany Spears has lost her Kids to Alcohol and Drugs!

Spears' former husband, Kevin Federline, is to retain custody of their two sons "until further order of the court," according to a ruling by Superior Court Judge Scott Gordon.

It was not clear what led to Monday's decision awarding Federline full custody. A transcript of the court proceedings was ordered sealed.

Last month, a judge ordered Spears, 25, to submit to random drug tests after finding she engaged in "habitual, frequent, and continuous use of controlled substances and alcohol."

That order, also by Gordon, provided no details and did not name any drugs.

The former couple has been embroiled in a bitter custody fight over their sons, Sean Preston and Jayden. The parents had split custody 50-50, but Federline then asked for the arrangements to be shifted to 70-30 in his favor.