Why Britney Lost Custody

We now know exactly what went down in court Monday when L.A .County Superior Court Commissioner Scott Gordon stripped Britney Spears of physical custody of Sean Preston and Jayden James.

As we first reported, Britney didn't follow a number of conditions the Commish laid down. But sources tell us three factors were the last straws for Gordon.

Britney was supposed to sign a document that would have given the green light for a custody evaluator to conduct psychological evaluations. Commissioner Gordon ordered Spears to get the signed document to Mark Vincent Kaplan, K-Fed's lawyer, by Monday at 10:00 AM or appear in court. She did neither.

- The judge ordered both Kevin and Britney to submit proof they had valid California driver's licenses and insurance. He also ordered that neither party drive with the children if they didn't have the proper license. Over the weekend, TMZ posted video of Spears driving with the kids in Malibu. She did not have a California license at the time. The TMZ posting was discussed in court and the Commish was pissed off.

- The biggest reason for the change was Thursday night, Britney was at a Social Group event at Sutra nightclub in Costa Mesa. TMZ shot video inside the club. Various people say they saw her drinking alcohol after midnight. According to Gordon's order on September 17, neither Britney nor K-Fed were allowed to consume alcohol within 12 hours of the time they obtained physical custody of the kids. We know Britney picked the children up at 12 noon on Friday, which means she would have violated Gordon's order.