Madonna has likened Britney Spears‘ conservatorship to “slavery”, becoming the latest high-profile figure to criticise the controversial arrangement.The Queen of Pop voiced her support for Spears on Instagram by sharing a photo of herself wearing a T-shirt with Britney’s name on it.She captioned the image: “Give this woman her life back. Slavery was abolished so long ago! Death to the greedy patriarchy that has been doing this to women for centuries.