Britney 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 at 7pm  Thursday (local time). Spears lost primary custody of her boys in October.

Britney taken to hospital for tests to see if she was under the influence of alcohol or drugs and for a psychological evaluation after police were called to her home Thursday night to mediate a custody dispute, a police spokesman said.