Lawyers for Britney Spears and Kevin Federline will be present Thursday morning for an emergency hearing in their ongoing custody battle.

A source close to the case confirms the hearing was called by Federline’s attorney, Mark Vincent Kaplan, who’s alleging that Spears has failed to follow drug-testing procedures.

Spears, 25, and Federline, 29, are not expected to show.

“If Spears hasn’t been following drug-testing procedures, ultimately the court could suspend all her visitation rights until she follows court orders,” says L.A. family law attorney Joel Schwartz, who’s not involved with either party. “Her mistakes will stack up against her.”

TMZ.com first reported the story.

The singer must submit to twice-weekly random drug and alcohol tests, and is required to give a urine sample within six hours of being called. The court had specified that a missed test will be considered a failed test.

On Oct. 30, Spears’s visitation rights with her sons Preston, 2, and Jayden James, 1, were scaled back after her parenting coach was critical of the pop star.

Spears “rarely engaged with [her] children in either conversation or play” during their monitored time together, the coach testified last month.

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My question is – will Britney EVER learn?