Troubled pop star Britney Spears fled her lawyer's office in tears on Wednesday (15Aug07) after a meeting to discuss her custody battle with ex-husband KEVIN FEDERLINE. The 25-year-old singer and Federline's divorce was finalised last month (30Jul07), with the couple agreeing to joint custody of their sons Sean Preston, 23 months; and Jayden James, 11 months. However, following Spears' erratic behaviour in recent weeks, Federline is now seeking full custody of the two boys and has subpoenaed her assistant Alli Sims, her former sidekick Shannon Funk, and her bodyguard Daimon Shippen to testify in the case. Spears met with her lawyer Laura Wasser in Los Angeles on Wednesday and was photographed crying as she left. Later that evening, Spears met up with Las Vegas magician Criss Angel to discuss a possible collaboration at the forthcoming MTV Music Video Awards.