Lollapalooza 2011: Eminem, Cee Lo Green, Damian Marley & Nas

It was no secret that Lollapalooza will return to its familiar home of Grant Park in Chicago this summer, as it celebrates its 20th anniversary -- but the lineup is in, the rumors were right and the verdict is two thumbs up. Way up. This year's headliners for the annual, three-day, mega-fest are: Eminem, Foo Fighters, Coldplay, Muse, My Morning Jacket, deadmou5 and A Perfect Circle, with additional marquee slots by Cee Lo Green, Damian "Jr. Gong" Marley & Nas, the Cars and Ween.

The above acts will anchor a lineup that, in true Lollapalooza style, is as varied as it is impressive and the full lineup demands its due -- but some of the other bands that we'd be remiss not to mention at the top include: Deftones, Crystal Castles, Atmosphere, Sleigh Bells and Lykke Li.

"As excited as I am to watch this year's legends perform at Lolla, I am also feeling the enthusiasm for the younger groups who are just now breaking," said festival founder Perry Farrell, in a statement released to the press. "I take great delight in knowing that for the past 20 years we've given so many new artists a prestigious stage and a massive audience to play in front of."

In recent years, the festival has been steadily building Perry's -- an electronic-centric showcase tent curated by Farrell himself and catering, this year, to what he describes as "muscular beats." Acts slated for the newly expanded tent, which will hold 15,000 bouncing and flailing fans, include Busy P, Girl Talk, Pretty Lights, Kid Cudi and Glitch Mob.

In an increasing trend for major music festivals, while the lineup was just announced, early-bird tickets are already sold out. All other three-day tickets are on sale now; check out the official Lollapalooza website to peep the deets. And remember, while the festival takes place on August 5 - 7, you should probably start hoarding sunscreen now. Grant Park is notoriously hotter than the Empire Polo Fields. Seriously.