The duo made their first red carpet appearance together Wednesday night at A Christmas Story: The Musical on Broadway. John's dad, Richard, joined the twosome for the holiday-themed night of fun.
While a festively dressed Katy was all smiles with John by her side, she also wrapped her arm around another man backstage: Santa Claus!
Jolly Old Saint Nick, played by Eddie Korbich on the Great White Way, grinned alongside our favorite California Gurl.
So festive! We're willing to bet Katy and John are both on the nice list this year.