That's what went down Sunday night ... 'cause former President Donald Trump schmoozed it up with golfer Dustin Johnson and Paulina Gretzky during a Halloween bash at his Mar-a-Lago Club in Florida.
DJ, his fiancée and friends socialized with #45 during the gathering -- with Trump greeting Paulina with kisses on both cheeks, saying, "You look great."
While Johnson sported a tennis pro outfit and Gretzky went with a Baywatch uniform, Trump appeared to either ditch the costume dress code or go as himself .