Kings of Leon have been announced as grand headliners for Heineken Open'er 2009.
The US chart toppers are set to take on the top spot on the final day of the Polish festival this summer.
The quartet join fellow American Moby, who was previously confirmed, alongside UK talents Basement Jaxx, Duffy and Placebo.
The hefty British contingent will also include ska legends Madness as well as The Kooks, The Gossip and festival favourites The Ting Tings.
Crystal Castles and Buraka Som Sistema complete the bill so far, along with Oriental urbanites Speed Caravan.
The festival will take place from 11 – 15 August at the Baby Doly Airfield near Gydnia, on Poland's Baltic coastline.
Tickets to the event are available priced from 100PLN for a day ticket and 280PLN for a multi-day pass.