Britney gives Kevin the middle finger

Britney Spears has hit out at her husband Kevin Federline on her website via a picture underneath a poem thought to be about the dancer.

The image shows Britney and four friends with their middle fingers raised and smirking at the camera, and is featured underneath a poem entitled "Remembrance of Who I Am".

The poem, believed to be written by Spears, tells of how Britney felt tied down in "chains" and asks the addressee: "How do you stand sleeping at night?"

It then talked about being "manipulated" and "swallowed", and mentioned "the sins of the Father".

A source told the Daily Mirror: "Britney is at her wits' end. She's furious with Kevin. She has some serious decisions to make. She really wanted the marriage to work for her family, but it seems harder by the day."

The couple's 20-month marriage has reportedly been rocked by Federline's partying lifestyle and his out of control spending.

Britney is currently pregnant with their second child - they already have a baby son, Sean Preston.