LATEST: Britney Spears' son JAYDEN JAMES was rushed to hospital in Los Angeles hospital alongside his mother after a major stand off with police. The troubled singer was taken from her Beverly Hills mansion in an ambulance on Thursday (03Jan07) evening after she refused to hand over her two sons to her former husband Kevin Federline. She is currently being held for a psychiatric evaluation. However, it has been reported that her one-year-old son Jayden James was also taken to Cedars-Sinai Medical Center following the ordeal - transported in a separate ambulance to his mother. It is not yet known what the tot is being treated for. Kevin Federline is said to have followed the two ambulances to the facility arriving at 12:20am, while a car carrying the couple's other son, two-year-old Sean Preston, arrived at Federline's house a short while later. Emergency services including police helicopters, fire crews and medical teams were called to the star's home after she refused to let her two sons go back to the care of their father after a scheduled visit. Cops are reported to have found Spears "under the influence of an unknown substance" after the incident, which is being referred to as a "family custody dispute" by the Los Angeles police department. Details of who made the original emergency call have yet to be released.