Julie and Doug's New Year's Eve party is crashed by an unexpected couple.  Kristen vows not to let Nicole steal her man.  Stefano blames Gina for his plan not going well and suggests they end their partnership.  Stefano tells Gina about his near misses with Kayla & Hattie.   Gabi & Eli talk about who may have smashed the window.  Brady & Nicole attend the party. Stefano & Gina discuss going as their true selves.