Britney Spears has managed to miss her first visit with her two sons - because her intercom was broken.

The troubled popstar was expecting her first supervised visit with Sean Preston and Jayden James since losing her custody battle with ex-husband Kevin Federline at her Malibu home.

However, the next thing she knew she was getting a phone call from one of K-Fed's aides saying the party had been and gone because no one had answered their repeated buzzes of the intercom, which Britney had not realised was out of order.

A source tells the Mirror, "Brit didn't realise the intercom wasn't working. She begged them to bring the boys back.

"But they wouldn't. She was devastated that they wouldn't turn around. Brit was up in plenty of time to prepare for the boys' visit at 10am. But she waited, and waited, and they didn't show up."