The pair have come under fire from Serbian singer Viktorija - whose real name is Snezana Miskovic - who claims their chart-topping collaboration Uptown Funk is a rip off of her 1984 single Ulice Mracne Nisu Za Devojke, which translates as 'Dark Streets Are Not For Girls'.
She said: "Their song Uptown Funk contains 80% of my tracks. How much of it are you allowed to take as inspiration for your song?"
Despite claiming the song is "80%" hers, the 56-year-old star insisted she has not yet decided whether to sue them and instead just wants to have her contribution appreciated.
She told the Daily Star newspaper: "I'm in no hurry to sue them, these processes take a long time, and my life and career does not depend on lawsuits.