spearsboy010408.jpg The Pop Princess is exhausted after a dramatic night where the police and fire departments were called to her Hollywood hillside mansion. Chauffeured in an ambulance Britney ended the night at Cedars-Sinai Medial Center where the singer and mother of two will undergo a medical evaluation. Spears' son Jayden-James was removed from his mother's mansion by medical staff.

Britney Spears bspearsarrives010408.jpgVideo of Britney’s arrival to the emergency room coming …