There are reports that police have been called to Britney’s house tonight. Apparently Britney was not ready to give up time with her sons Sean Preston & Jayden James quite yet:

“The pop star was due to turn over Sean Preston, 2, and Jayden James, 1, at 7 p.m. PST. Federline’s bodyguard arrived at her home to pick them up, but Spears would not budge. She has been with the kids since noon Thursday.

Ninety minutes later, police arrived.

“There have been police sent to that residence,” an officer tells Us Weekly. “We don’t know anymore at this time, but apparently they’ve arrived.”

Spears’ attorney, Sorrell Trope, tells Us, “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.”

TMZ has confirmed that LAPD has been called to Britney Spears’ house in Beverly Hills for what we’re being told is a “family custody dispute.”

LAPD tells us the call came in around 8:00 PM 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.