Eminem, Coldplay, Foo Fighters and Muse will help Lollapalooza ring in its 20th anniversary as the headliners of the annual U.S. music festival. The full lineup for Lollapalooza 2011, which will invade Chicago's Grant Park on August 5-7, was revealed on the festival's official website early Tuesday morning (Apr. 26).

For Eminem, the headlining set follows a triumphant 2010 in which he scored the best-selling album of the year ("Recovery") and a pair of Hot 100 chart-toppers ("Not Afraid" and "Love the Way You Lie"). The rapper is also set to headline the 2011 Bonnaroo festival, which takes place June 9-12 in Manchester, Tenn.

Meanwhile, the Foo Fighters are coming off the first No. 1 album of their career, as "Wasting Light" topped last week's chart with 235,000 copies, according to Nielsen SoundScan. Muse, who are also playing the Outside Lands festival and Reading and Leeds festival this August, recently supported U2 on the South American leg of their 360° Tour.

Eminem, Foo Fighters and Muse were all reported to be topping this year's Lollapalooza lineup in early February. Coldplay, who have been confirmed for this year's Glastonbury Festival and are readying their fifth album, have joined the groups as the fourth headliner.

Other featured artists playing the festival, which was founded in 1991 by Jane's Addiction frontman Perry Farrell, include alt-rock mainstays My Morning Jacket, soul maestro Cee Lo Green, "Distant Relatives" collaborators Damian "Jr. Gong" Marley & Nas, and dance superstar deadmau5, as well as A Perfect Circle, Bright Eyes, The Cars, Big Audio Dynamite, Ween, Arctic Monkeys, Explosions in the Sky, Death From Above 1979, Deftones, Beirut, Flogging Molly, OK Go, The Kills and Cold War Kids.

In addition, Lollapalooza 2011 will also include sets from The Mountain Goats, Atmosphere, Titus Andronicus, Ratatat, Best Coast, Crystal Castles, White Lies, Lykke Li, Local Natives, Black Lips, Delta Spirit, Sleigh Bells, The Pains of Being Pure at Heart, Wye Oak, The Drums, Smith Westerns, The Naked and Famous, Phantogram, Dale Earnhardt Jr. Jr., The Joy Formidable, Young the Giant and Cults.

On top of those act, Fall Out Boy’s Patrick Stump, Ryan Bingham & The Dead Horses, Grace Potter & the Nocturnals, Cage the Elephant, Rival Schools, The Chain Gang of 1974, Friendly Fires, Portugal. The Man, Manchester Orchestra, Two Door Cinema Club, Noah & The Whale, Lissie, Foster the People, Mayer Hawthorne & the County, Fences, City and Colour, and Gold Motel are also slated for the August festival.

Also, this year will include the premiere of a 15,000-capacity dance tent offering up performances by Girl Talk, Kid Cudi, Pretty Lights, Skrillex, The Glitch Mob, Jay Electronica, Modeselektor, Daedulus, Feed Me, Busy P and Joachim Garraud. Festival founder Perry Farrell is also set to make an appearance as part of a PerryEtty Vs. Chris Cox set.

2011 marks the 20th anniversary of Lollapalooza's formation as an alternative touring festival, and its seventh year as a stationary fest in Chicago's Grant Park. Last year's lineup was headlined by Green Day, Lady Gaga, Arcade Fire, Phoenix, the Strokes and a reunited Soundgarden.

Tickets for the festival are currently on sale at the festival's website, with 3-day passes available at $215.