Red Hot Chili Peppers are set to headline next year's instalment of Open'er.
The American legends will play the enormous Polish event next summer, becoming the second headline act to be confirmed following news that Florence + The Machine will also play the Gdynia event.
The move comes as the Stateside group prepare for a lengthy series of international shows, designed to promote their forthcoming Danger Mouse-produced studio album.
Anthony Kiedis recently commented that he feels new Chilis material is "as good as any songs we've ever written."
Open'er runs between June 29th - July 2nd.