Spears's kids graduate from pre-school

Britney Spears's two children have reportedly graduated from their pre-school.

According to People, the singer was in attendance to support Sean Preston, 4, and 3-year-old Jayden James at their San Fernando Valley school on Thursday.

"[She] was very excited about her boys' graduation and she dressed them up for the festive occasion," said a source.

The 'Womanizer' star was joined by her parents, while ex-husband Kevin Federline - the boys' father - is reported to have arrived separately.

Federline previously said that he was "very happy" about Spears's comeback success and that their relationship is "getting better and better" as time goes on.

The couple divorced in 2006.