Britney Spears has finally arrived at lawyer MARK VINCENT KAPLAN's Los Angeles office for an ongoing deposition in her custody battle with ex-husband KEVIN FEDERLINE. The pop star has missed a string of appointments for the court-ordered cross examination with Federline's attorney, but made sure to turn up for the latest meeting on Monday morning (21Jan08). This comes a week after the Toxic singer failed to appear for a custody hearing in a Los Angeles court. Wearing jeans and a dark blue top, Spears was escorted to the deposition by companion Sam Lutfi. The singer is expected to face questions about her drug and alcohol use and her parenting skills. Kaplan plans to use testimony from Spears and other key witnesses to convince Los Angeles Commissioner Scott Gordon that his client, Federline, should retain primary physical custody of his two young sons with the pop star. Spears has been stripped of all custody and visitation rights following a string of ill-advised incidents. A custody trial is set for April (08).