Barry Keoghan

Barry Keoghan's new movie got a song that came out over 20 years ago back on the charts -- and it's all thanks to a neat little dance he did at the end where he's butt-ass naked. Of course, we're talking about "Saltburn" and the end scene where the main character successfully snuffs out an…

Barry Keoghan is the total package ... 'cause that was all him in the naked scene of his new movie "Saltburn." Be wary; there are some spoilers ahead ... near the end of the Amazon Prime flick, Barry's character Oliver bares it all while busting out a celebratory dance -- with fans shocked to…