Madonna has spoken out in support of Britney Spears , saying her conservatorship is a violation of human rights.

The singer, who featured on Spears single Me Against The Music, is the latest star to admonish the complex legal arrangement that has overseen Spears life and career since 2008.

Last month, Spears called for the conservatorship to be terminated and said she had been forced to work, likening the situation to sex trafficking.