Katharine McPhee joined the cast of NBC’s ‘Community’ as a guest star, where the ‘American Idol’ season five runner-up learned very quickly that stars Joel McHale and Chevy Chase spend as much time as they can behind the scenes goofing off. “This is fun,” McPhee told ‘Access Hollywood’. “I’ve done a couple of different things. I’ve been able to do a couple of guest spots on some other shows, but this is by far the most fun I’ve had as a guest star.” Kat added that Joel and Chevy are a blast on the set. Watch the interview below.