Just seven months after they separated, Britney Spears and Kevin Federline are officially divorced - but Kevin may still contest Britney’s custody of their two children.

The couple married in September 2004 and Britney gave birth to their sons Sean and Jayden in the two subsequent Septembers, before filing for divorce last November.

Neither party was present at the Los Angeles County Superior Court yesterday when Judge Scott Gordon signed the decree ending their marriage but Britney’s lawyer Laura Wasser confirmed the news to reporters as she left the courtroom.

Custody arrangements for Sean and Jayden will be finalised next month and the judge granted Wasser request that the custody and child support provision be kept secret for the safety of the two boys until at least the next court date.

The couple are believed to be currently sharing physical and legal custody of the boys but after Britney’s behaviour of late - including taking them out of California without Kevin’s written permission last week, has reportedly caused concern in the Federline camp.

An inside source told Us Weekly that Kevin’s lawyer Mark Vincent Kaplan “has been watching and monitoring Britney’s behavior very closely.”

“There is a clause in the divorce so either parent can seek full custody and it is very possible that you will see Kaplan seeking full custody for Kevin as early as this week.”

“Kevin is extremely concerned with Britney’s erratic behavior and he needs to make sure his kids are protected. Britney has not met the benchmarks for sobriety that [were] outlined in the agreement.”