Kaitlin Olson, from left, Danny DeVito, Rob McElhenney, Glenn

Download this stock image: Kaitlin Olson, from left, Danny DeVito, Rob McElhenney, Glenn Howerton and Charlie Day arrive at The Paley Center for Media's An Evening with It's Always Sunny in Philadelphia at The Paley Center for Media on Friday, April 1, 2016, in Beverly Hills, Calif. (Photo by Rich Fury/Invision/AP) - 2MYYMH4 from Alamy's library of millions of high resolution stock photos, illustrations and vectors.

More Hollywood actors turn up in Wrexham as Rob McElhenney's 'It's Always Sunny in Philadelphia' co-stars watch team beat Yeovil - Wales Online

Glenn Howerton, from left, Danny DeVito, Charlie Day, Rob McElhenney and Kaitlin Olson attend the 2017 Vulture Festival Los Angeles It's Always Sunny in Philadelphia at the Hollywood Roosevelt Hotel on Sunday

Wrexham star Paul Mullin reveals how he embarrassed himself in front of Rob McElhenney's wife Kaitlin Olson during chat about 'It's Always Sunny in Philadelphia

Kaitlin Olson, Rob McElhenney, Charlie Day and Danny DeVito LA premiere of 'It's Always Sunny In Philadelphia' and 'The League' Stock Photo - Alamy

It's Always Sunny in Philadelphia' cast: How their lives have changed, Gallery

Kaitlin Olson, Danny DeVito and Rob McElhenney Danny DeVito is honoured with a star on the Hollywood Walk of Fame, held on Stock Photo - Alamy

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2016 LA Pride Festival Day 3 Featuring: Danny DeVito, Charlie Day, Rob McElhenney, Kaitlin Olson, Stock Photo, Picture And Rights Managed Image. Pic. WEN-WENN24563077

Why It's Always Sunny's Characters Will Never Grow Up

Kaitlin Olson, from left, Danny DeVito, Rob McElhenney, Glenn Howerton and Charlie Day arrive at The Paley Center for Media's An Evening with It's Always Sunny in Philadelphia at The Paley Center