Everyone’s worst fear has just gone down!

Britney Spears kept her kids after the court-appointed time that she was supposed to give them back. She was refusing to give the kids to Kevin Federline‘s body guard, causing the police to be notified.

The cops were there for over 3 hours, even Kevin’s attorney, Mark Vincent Kaplan, and Britney’s attorney, Anne Kiley, were present.

The scene was complete chaos… with paparazzi running a muck and several helicopters flying overhead. Cops threatened to arrest Britney if she didn’t hand over the children.

TMZ reports,

LAPD said the call came in around 8:00 PM PT this evening, but they would not tell us who made the call or what the specific problem was. Officers, we’re told, are still on scene.

Spears, who was nearly two hours late for today’s scheduled deposition in her custody case, was reportedly scheduled to have her sons tonight until 7:00 PM.

K-Fed’s bodyguards went to pick up Sean and Jayden at Britney’s home this evening after her scheduled visitation, but Spears refused to turn the kids over.

Police were then called. Britney’s soon-to-be ex- attorney Sorrell Trope told the mag, “In a normal case when someone shows up with a certified court order saying the kids need to be somewhere else, the police see to it that the order is obeyed. But that is in a normal case.”

As time progressed, fire engines and then an ambulance showed up. Paramedics took a gurney and a backboard into Britney’s home. Cops had discovered that Britney was “under the influence of an unknown substance.”

Britney was then taken from the home and transported via ambulance at the Cedars Sinai Medical Center in Los Angeles. Police had erected screens to shield her from waiting photographers. Federline and Sam Lutfi arrived separately.

Jayden James was transported via another ambulance! No word yet on what was wrong with the poor little guy.

When Britney was brought out of the ambulance [at the hospital], she flipped off the waiting paparazzi. They are stating that Britney had lost a tremendous amount of weight, due to stress and mental anguish. They forgot to mention the freaking drugs!

I’m just completely astounded! I’m seriously thinking that Lynne Spears should be arrested!

sources: More Cops, Ambulance Now at Spears’ House! [tmz]; Britney Spears Shuttled Via Ambulance to Cedars Sinai [us]; Brit’s Kids Are Safe, She’s Under the Influence! [tmz]; [page six]