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U.S. 4th Sep, 2018. 04 September 2018 - Westwood, California - Kaitlin Olson, Rob McElhenney. Premiere Of FXX's ''It's Always Sunny In Philadelphia'' Season 13 held at Regency Bruin Theatre. Photo Credit:
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It's Always Sunny''s Rob McElhenney reveals the brutal regime it took to get his 'perfect physique' for season 13
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