Washington DC, July 4 -- Actor and TV producer Glenn Howerton talked about the success of the sitcom, 'It's Always Sunny in Philadelphia' during a recent PaleyLive panel with Charlie Day, Danny DeVito, Rob Mac and Kaitlin Olson, in celebration of its 20th anniversary, reported People.

When discussing his role as an actor, writer, co-creator and executive producer on the sitcom, Howerton revealed he didn't always know if he'd still be part of it all these years later.

"It was actually before we started working on season 12, I was like, 'Look, I just don't want to wear out our welcome,'" he shared. "I was worried that maybe we had sort of peaked or something, and I just was like, you know, we've been doing this for a long time. And I thin...