Justin actually met Garth the night before, at the country legend's concert in St. Louis. He shared a photo of them together on his Instagram with the caption, "One of my IDOLS. Garth... You are a MASTER of your craft. I am in awe of you, still."
The meeting seemed to have inspired Timberlake during his show in Oklahoma City the next night when he covered Garth's "Friends in Low Places." Justin's fans seemed to like it too because they were all singing along!