It’s Always Sunny in Philadelphia stars Rob McElhenny and Kaitlin Olson have appeared in the new Imagine Dragons music video for ‘Follow You’ – check it out below.The actors and real-life couple – who play Mac and Dee in the hit sitcom alongside Danny DeVito, Charlie Day and Glenn Howerton – feature in the video starring as themselves.In the video, Olson has prepared a surprise private birthday concert for McElhenny featuring his favourite band, before revealing she had in fact booked her own