Gallery: 'It's Always Sunny' cast, crew take over Center City
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Mayor Jim Kenney stopped by the Market Street set of 'It's Always Sunny in Philadelphia' on Friday, July 1, 2016. He's pictured with, from left, Charlie Day, Rob McElhenney, Danny DeVito, Glenn Howerton and Kaitlin Olson.
Brian Hickey/PhillyVoice
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Danny DeVito is shown on the set as 'It's Always Sunny in Philadelphia' filmed scenes near 10th and Market streets on Friday, July 1, 2016.
Brian Hickey/PhillyVoice
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Rob McElhenney prepares to go before the cameras at the 'It's Always Sunny in Philadelphia' set on Friday, July 1, 2016.
Brian Hickey/PhillyVoice
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'It's Always Sunny in Philadelphia' co-star Charlie Day sneaks in a phone call between takes.
Brian Hickey/PhillyVoice
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A makeup artist touches up Rob McElhenney, of 'It's Always Sunny in Philadelphia' fame, before filming started near 10th and Market streets on Friday, July 1, 2016.
Brian Hickey/PhillyVoice
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St. Joe's Prep alumni Jim Kenney and Rob McElhenney chat on the set of 'It's Always Sunny in Philadelphia' on Friday, July 1, 2016.
Brian Hickey/PhillyVoice
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'It's Always Sunny in Philadelphia' stars Rob McElhenney, Danny DeVito and Glenn Howerton take a break from shooting scenes near 10th and Market streets on Friday, July 1, 2016.
Brian Hickey/PhillyVoice
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Fans gathered across Market Street as the FXX series 'It's Always Sunny in Philadelphia' crew and cast filmed exterior scenes on Friday, July 1, 2016.