Madonna is on the defensive after critics slammed the singer for tweeting photoshopped images of Nelson Mandela and Martin Luther King Jr. to promote her upcoming album, “Rebel Heart.”

In a Facebook post shared on Saturday, the 56-year-old apologized before explaining her decision to share the photos. She wrote that her fans were the creators of the images, but added that neither she nor her fans are racist:

The controversial photos of Mandela and Martin Luther King Jr., which were posted on Madonna’s Twitter account on Saturday, feature the men with black rope bound to their faces, àla Madonna’s “Rebel Heart” cover art.

For comparision, here is Madonna’s “Rebel Heart” cover art:

X-mas is coming early! Pre order my album and download 6 tracks! Happy Holidays! ❤️#rebelheart pic.twitter.com/YBiJccfQQ4

— Madonna (@Madonna) December 20, 2014

Here are the altered photos of Nelson Mandela and Martin Luther King Jr.:

This❤️#rebelheart fought for freedom! pic.twitter.com/7OxGT28TuY

— Madonna (@Madonna) January 2, 2015

This ❤️#rebelheart had a dream! pic.twitter.com/PIwcwosS2G

— Madonna (@Madonna) January 2, 2015

Madonna also tweeted similar photos of Princess Diana and Bob Marley in the style of the “Rebel Heart” album cover on Saturday:

Yes Princess Diana was. ❤️#rebelheart! Anyone who fights for freedom is a ❤️#rebelheart pic.twitter.com/GDH6W6NFPC

— Madonna (@Madonna) January 3, 2015

This❤️#rebelheart sang about ONE LOVE! pic.twitter.com/7RGdpL4yzy

— Madonna (@Madonna) January 2, 2015

In December, Madonna tweeted various photos of people wrapped in black cords, including fans and celebrities like Miley Cyrus, Lady Gaga, Marilyn Monroe, Skrillex and Diplo. She also shared an altered photo of a statue of Jesus Christ with the “Rebel Heart” ropes wrapped around it.