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It’s been lucky No. 7 for “It’s Always Sunny in Philadelphia” writer-producer-star Charlie Day. While most long-running shows start sagging, “Sunny’s” seventh season is garnering series highs across the board, including a 33% hike in total viewers. Day also co-starred in the hit “Horrible Bosses” this year. He topped off his game-changing 2011 run with his first hosting gig on the Nov. 5 “Saturday Night Live” and by taking his place on the set of Guillermo del Toro’s “Pacific Rim.” Not bad for a guy known for playing dimwits.

“It’s not anything I consciously decided to do, but it’s really fun to do these extremely stupid characters,” Day says. “There’s an innocence and charm to them. All our favorite characters in comedy have a touch of that.” As a “Sunny” writer, Day controls his character’s development, but for films, “Charlie Day the actor told Charlie Day the writer to shut up,” he says. “I don’t know that anything creative is consciously mapped out. Guillermo’s film might change my voice, or ‘Saturday Night Live.’ You find something you do that works, or doesn’t. It’s not a mathematical science, just a gut check.”