She's responded to critics, saying that she is "not comparing" herself to anyone, but "admiring and acknowledging" them.

　　Last week, Madonna drew attention after she shared altered photographs of Martin Luther King Jr., Nelson Mandela and Bob Marley through her Instagram account.

　　She claims the photos were tweaked by "fans," not herself, in order to appear similar to the cover of Madonna's upcoming album, Rebel Heart.

　　Madonna thanked her fans for recreating her album cover using the images of so many "great" heroes, thus "celebrating" them as "great freedom fighters."