Update: Madonna has released an official apology.
"I am sorry if I offended anyone with my use of the N word on Instagram," she said.
"It was not meant as a racial slur.. I am not a racist. There's no way to defend the use of the word. It was all about intention.. It was used as a term of endearment toward my son who is white. I appreciate that it's a provocative word and I apologize if it gave people the wrong impression. Forgive me."
Madonna used the N-word in an Instagram of son Rocco on Friday night, but altered the offending caption after an outcry by fans.
According to Us Weekly, the "Vogue" singer wrote the following in a caption accompanying a photo of her 13-year-old boxing:
"No one messes with Dirty Soap! Mama said knock you out! #disni—a"
She altered the post just minutes later after a string of angry comments appeared in response to the use of the racial slur.
You can see a screengrab of the original Instagram here.
But instead of apologizing, the singer wrote, "Ok let me start this again. #get off of my d-ck haters!"
As of publication, the Instagram with the new caption—and all of the impassioned responses—is still up on her official account.
This is not the first time the Material Girl, who turned 55 this year, has caused a stir on the social media site.