Luke Bryan wasn't expecting to turn on the water works during Sunday's big season 21 finale! While fellow judge Katy Perry found herself getting expectedly emotional during the star-studded finale — as she's a judge who is known to wear her heart on her sleeve — Bryan surprised some fans when he shed a few tears as well during the showdown between the season's Top 3 -- Megan Danielle, Iam Tongi, and Colin Stough.Speaking with ET's Denny Directo after the show, Bryan joked, «I never anticipated crying on national TV that much.»«But I think we're just mimicking what people are feeling at home,» he added.Ultimately, 18-year-old Tongi was crowned the champion, and Bryan shared some words of wisdom for the up-and-coming performer.«I think the main thing is, you have to make sure it's all on your terms, and when somebody is trying to push you down a creative path you may be unsure of, just trust your gut on stuff,» Bryan shared. «Also, understand that you're gonna make some mistakes.