The American Idol judges may have a serious responsibility ahead of them as they search for the next big star, but that doesn't mean it's strictly business at work. Luke Bryan and Katy Perry recently had some fun on the Idol set, dressing up as their fellow judge, Lionel Richie. In a picture posted on Instagram, Luke and Katy can be seen standing next to Richie as they each don a curly wig and thick mustache to mimic Lionel's signature 1980's look. Bryan wrote in the caption, "Trust me, you're gonna want to tune in for @AmericanIdol."The new season of American Idol kicks off on March 11 at 8 PM ET on ABC.