Madonna has been forced to apologise after posting defaced images of Martin Luther King, Nelson Mandela and Bob Marley (below right) on her Instagram account.
The singer has faced accusations of racism after re-posting fan art of famous people's faces tied up in rope made to look like the cover of her forthcoming album Rebel Heart (isnet above).
Fans called the singer "inappropriate" and "disrespectful", with one user writing: "I can't believe you would stoop this low."
Another commented under the image of Nelson Mandela: "He fought for freedom not to promote your album! Shame on you!"
In a statement, the singer said: "I'm sorry / I'm not comparing myself to anyone / I'm admiring and acknowledging there Rebel Hearts."
She said that the artworks had been made by fans, not herself, and that she had included a large number of celebrities such as Marilyn Monroe, Frida Kahlo and Michael Jackson.