In July 2013, Jay Z and performance artist Marina Abramović collaborated on a performance at Pace Gallery in New York. The performance was inspired, in part, by by Abramović's 2010 exhibition The Artist Is Present at MoMA. It was filmed and used for Jay Z's "Picasso Baby" music video. (Read more about the confusing collaboration here.) Now, nearly two years later, Abramović is upset because Jay Z never donated money to her art institute like he said he would. Here's what Abramovic said about it in a recent interview with Spike magazine:

I am very pissed 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 power point presentation [sic] and said: okay, you can help me, because I really need help to build this thing. Then he just completely used me. And that wasn’t fair.”

Jay Z denies Abramović's accusations. Jeanne Greenberg Rohatyn - a New York art dealer and producer of "Picasso Baby" - read a receipt from Abramović's foundation over the phone to artnet News this morning. The receipt reads "Thank you for your donation" and is marked with the number W984804. Greenberg Rohatyn says the receipt acknowledges a substantial donation made by Jay Z.

Abramović's dealer, Sean Kelly Gallery in New York, asked Abramović for clarification this morning after Jay Z's defense surfaced. The Marina Abramović Institute tweeted an apology, claiming "Marina Abramović was not informed of Shawn "Jay Z" Carter's donation from two years ago when she recently did an interview with Spike Magazine in Brazil."