Hip hop mogul Jay Z has been accused of not keeping his promise to performance artist Marina Abramovic and she is furious.
The Serbian creative was invited to star in the Tidal owner's Picasso Baby music video in 2013, which was filmed at the Museum of Modern Art (MoMA) in New York.
The 68-year-old claims she was promised somewhat of a deal by Jay Z – that she would perform her piece The Artist Is Present for his video if the Watch The Throne star helped to promote a new venture she had been working on.
Venting her frustrations to Spike magazine, Abramovic said: "I am very p****d by this, since he adapted my work only under one condition: That he would help my institute. Which he didn't.
"The day before, he came to my office and I gave him an entire PowerPoint presentation and said: 'OK, you can help me, because I really need help to build this thing.'"
Watch Jay Z's Picasso Baby video:
Comparing Jay Z's generosity to that of pop star Lady Gaga, the artist continued: "Then he just completely used me. And that wasn't fair. This is very different from Lady Gaga, for example, who has done great work for me. Just by having 45 million followers, she brought all these young kids into my public."
When asked if she regrets working with the iconic rapper, Abramovic said: "In the end it was only a one-way transaction. I will never do it again, that I can say. Never.
"I was really naive in this kind of world. It was really new to me, and I had no idea that this would happen. It's so cruel, it's incredible. I will stay away from it for sure."
The music video was a spectacle with Jay Z performing the Magna Carta Holy Grail album track on repeat in 45-minute segments.
Members of the public watched from inside the museum along with several celebrities who received exclusive invites from the rapper, including movie director Judd Apatow, Empire actress Taraji P. Henson, The View host Rosie Perez and Scottish actor Alan Cumming.
Jay Z is yet to respond to Abramovic's claims.