Madonna has taken to Instagram to dismiss rumours of a feud with Lady Gaga.

The 56-year-old denied reports that Two Steps Behind, a track from her forthcoming Rebel Heart album, was about Gaga (28).

Madonna wrote, "There are those who want to shut me up but they cannot! We still live in a world that discriminates against women. Their (sic) are people that are so hateful. They want to create feuds between strong women that do not exist! I do not wish ill will towards any other female artist and I never have!

"The world is big enough for all of us! I will fight for my rights as an artist, a human and a woman till the end of my days! Because I am a #rebelheart and I walk in the footsteps of giants and I will not apologise or defend my unpublished, unfinished, stolen work.

"If you don't like who I am or what I have to say then why are you reading this? #unapologeticb**ch."

Madonna's manager Guy Oseary, who also manages U2, recently took to Twitter to deny the reports, writing, "That song is Not about Gaga or anyone in particular. The song is an unfinished demo she had no intention of finishing or releasing along with many others.

"She has No ill will towards Gaga. It's nonsense. She was listening to Gaga's Tony Bennett duet album last week and appreciating it."