Danny DeVito, Mary Elizabeth Ellis, Kaitlin Olson, Charlie Day, Rob McElhenney, Rhea Perlman, Lucy DeVito and Directors, Co-Creators Jackie Marcus Schaffer & Jeff Schaffe at "It's Always Sunny in Philadelphia" season seven premiere screening red carpet arrivals at Cinerama Dome in Los Angeles, Ca USA September 13, 2011 - It's Always Sunny in Philadelphia season seven premieres on Thursday September 15 at 10pm e/p on FX

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