Last night police were called to Britney Spears' Beverly Hills home after she refused to turn her two sons back to Kevin Federline. She was then rushed to the Cedars-Sinai Medical Center emergency room in L.A. Paramedics strapped Brit to a stretcher and she was wheeled out laughing at times.

The Associated Press is reporting that police were called about 8 p.m. to respond to a custody dispute between Spears and Federline. After about three hours, six more police cars, two ambulances and a fire truck entered the gated community and proceeded to Brit's home.Spears turned her two-year-old son, Sean Preston and one-year-old son, Jayden James over at about 10:50 p.m.

When arriving at the hospital she flipped off waiting parparazzi when she was pulled from the ambulance.

Reports are saying that Brit's father, Jamie, ex-husband, Federline and her man-friend, Sam Lufti, were all at the hospital shortly after her arrival. She was said to be under the influence of an unknown substance and was held for a mental evaluation.

Federline's lawyer, Mark Vincent Kaplan is set to be in court for an emergency hearing this morning in order to strip Brit off her visitation rights.

We support Britney here like anyone dealing with substance abuse, but can't help to wonder if she will see 2009! In her defense it was "thirsty Thursday"!