Britney Spears will temporarily lose custody of her two sons to ex-husband Kevin Federline, it has been reported.

And it appears that Britney has – yet again - sealed her own fate with her alleged outrageous behaviour.

Sources say that Commissioner Scott Gordon will order 2-year-old Sean Preston and 1-year-old Jayden James to be handed over K-Fed based on explosive new information relating to Britney’s alleged drug use, reports Foxnews.

During Monday's (September 17) custody hearing, lawyer Gloria Allred’s so-called ‘secret witness’ was revealed as Britney's former bodyguard, Tony Barretto.

Barretto – who came forward, according to Allred, because he was “very concerned” for the safety of the two boys -  filed a declaration which alleges that he witnesses the singer’s "nudity, drug use and safety issues post-rehab."

His declaration went "unrefuted and unchallenged" and was a major blow for Britney’s case in the on-going custody battle.

Barretto started working for the popwreck when she left rehab but was fired on May 17 because, Allred said, "He did not hear her when he was asked to pick up her hat."

The ruling granting K-Fed temporary custody of the children was expected to be handed down in Los Angeles Family Court later on Monday.

But this is far from the end of the matter – K-Fed's lawyer, Mark Vincent Kaplan, said the custody battle would go on at least until the end of the year.

Two new court dates have been set, one in November and one in December.