Britney Spears by Kevin Mazur/ Britney Spears by Kevin Mazur/

Los Angeles Superior Court Judge Scott Gordon has given Britney Spears a stern warning and reiterated the drug testing and therapy plan she must submit to, or else lose the supervised visitations with her kids. "A missed test, refusal to submit to a test or failure to respond to the testing agency's call... shall be deemed a failed test," Gordon says in court papers released Thursday. The judge also spelled out that Brit must complete "at least three individual counseling sessions" and "at least three joint [therapy] sessions" with ex-hubby Kevin Federline by the next court date (Oct. 26), and gave child services the charge to end her visitations "immediately" if any further erratic behavior is observed.

That "erratic behavior" clause may be put to the test when Spears' "Gimme More" video ( now playing on YouTube) officially premieres Monday on MTV.

TV Guide Network premieres the special Britney: Breakdown Saturday at noon/ET, to be repeated frequently throughout the weekend.