The Flaming Lips will join Basement Jaxx and The Prodigy as headliners for this year's Rock Ness.
Liverpool indie poppers The Wombats, Welsh rockers Super Furry Animals and Placebo have also been confirmed along with a slew of dance acts including Rob Da Bank, DJ Yoda, Erol Alkan and Radio 1 tastemaker Zane Lowe.
French house DJ David Guetta and Pete Tong will also head to the Scottish Highlands come June as well as Crookers and Brodinski.
Speaking about the latest additions to the festival, organiser Jim King said: "The new additions to this year's line up are all fantastic acts. The Flaming Lips' live performances are always unique and fit right in to the ethos of Rock Ness. It's going to be the first time they have played Scotland for a while and the band are promising to come up with another spectacular show.
"The Super Furries are festival favourites of ours and we've been after them for a couple of years so it's really brilliant they are with us this year especially with their new album. Pete Tong, Erol Alkan, Zane Lowe, Robby da Bank and Crookers and not forgetting David Guetta mean that the famous Rock Ness party vibe will continue strongly and that we'll definitely have the biggest party weekend of 2009."
Rock Ness 2009 will take place at Dores, on the shores of Loch Ness in Scotland from 12-14 June with organisers expanding the festival to three days.
Tickets are on sale now priced at £130 for a weekend pass or £139 with camping. Day tickets, campervan passes and VIP tickets are also available. A £30 deposit scheme has also been setup.
Around 35,000 festival-goers are expected to make the trip to the festival to enjoy seven arenas of live acts and DJs as well as stunning views of the Scottish Highlands.