Britney Spears has been taken to hospital after police were called to her house over a custody dispute.The 26-year-old pop singer was escorted from her hilltop home overlooking Beverly Hills in one of three ambulances that was part of a convoy of nine police vehicles and a handful of other cars.Spears reportedly refused to turn over her sons Sean Preston, 2, and Jayden James, 1, to the bodyguard of her ex-husband, Kevin Federline, as planned. LAPD spokesman Jason Lee said police were called to her house about an hour later to try to resolve the dispute.The singer was admitted to Cedars-Sinai Medical Center for an evaluation, and made a rude hand gesture to paparazzi as she was brought out of the ambulance on a stretcher. One of her two sons was also at the hospital.A media circus quickly formed outside the security gate to the Summit gated community where Spears lives, with four helicopters buzzing the scene as paparazzi and onlookers waited in the rain for developments.Spears, whose professional and private life has spiralled out of control in the last few years, lost primary custody of the boys to her ex-husband Kevin Federline in October.© Independent Television News Limited 2008. All rights reserved.