The Black Eyed Peas are facing legal action from British DJ Adam Freeland - he has accused the band of copying one of his songs.
Freeland claims the group used the beat from his track Mancry in Party All the Time, which featured on their latest record The E.N.D.
The star has taken to his Twitter.com page to express his outrage - alleging the Black Eyed Peas track sampled his work without permission.
He writes, "OK. Check this. Listen to our song 'Mancry'. Now listen to Black Eyed Peas 'Party all the time' WTF! (What the f**k!)"
Although Freeland has yet to take legal action against the band, lawyers for both sides have been in contact.
Black Eyed Peas star will.i.am was previously mired in controversy over samples used in his solo work - in 2007 he was forced to drop an excerpt from Daft Punk's Around in the World from his I Got it From My Momma track by the French duo's lawyers.