Turn down for butts! That's our motto, and you'll understand why after seeing the sexiest celebrity butts of 2018! Jamie Dornan freed his stacked seat meat in Fifty Shades Freed, Y’Lan Noel got humpy and rumpy on Insecure, social media favorite Tyler Posey was trending in our pants thanks to his nude scene in Sideswiped, and The Office alum John Krasinski opened his supply closet for us in Tom Clancy’s Jack Ryan. Small screen superstar Darren Criss showed off his big screen ass in American Crime Story, hotties Charlie Hunnam and Rami Malek were insanely sexy during a double shower in Papillon, and the adorable Disney star Ross Lynch was lethally hot in My Friend Dahmer. Plus it wouldn't be a Best Butts of 2018 playlist without Cameron Monaghan in Shameless, Josh Hartnett in Oh Lucy!, Russell Brand in Ballers, and Blake Jenner in Billy Boy. Feel free to BUTT in by letting us know your thoughts in the comments!