Wearing a cream, glittery gown with gold headband, Chrissy posed alongside her hunky hubby.
Legend mirrored John Travolta's epic "Saturday Night Fever" look in a white suit, black button down and gold chain.
The couple uploaded a series of photos documenting the costume party, that turned out to be only a party of two.
And of course, Legend had to get in a photo striking the memorable Tony Manero pose.
The always amazing couple needed a fun night, and gotta keep things interesting, especially now that they're juggling two little legends at home.