Spears heads back to school

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Britney Spears heads back to school

Britney Spears is taking math lessons.

The 'Toxic' hitmaker is taking pre-algebra classes so she is able to help her eldest son Sean, nine, with his homework.

She said: "They go to a really hard school, and this week we had three hours of homework [a night].

"Some of it is hard for me. Next year when [Preston's] in fifth grade, he's going to be doing pre-algebra, and I'm taking classes so I know how to do it!"

The 33-year-old star - who also has eight-year-old Jayden with her ex-husband Kevin Federline - has revealed she operates a reward system at home for her two boys.

She shared: "If they get so many A's, they get one toy a month.

"Preston just asked for a high allowance like $10 a week or $20 a week - but we'll see."

Meanwhile, Britney - who has been dating producer Charlie Ebersol for six months - has admitted she would like to have more children "in the future".

She told PEOPLE magazine: "I would like to have one more. I am very satisfied with my two boys but maybe in the future."

When asked if she'd like to have a baby girl, she added: "I would love a mini-me. That would be fun!"