You stars Victoria Pedretti and Dylan Arnold have been pictured out amid reports they are dating.
Katherine is a sort of temptress, appearing laughing with friends and dancing in dream sequences with intense eye contact with the main character, Rose.
She is married to the protagonist Joe Goldberg, played by Penn Badgley and they have a newborn son.
She seamlessly molds to both the past and future settings and gives an amazing performance as a wide-eyed and passionate music lover.
The actor sported navy slacks and a loose lip-print T-shirt tucked into his bottoms.
The possible couple play love interests in season three of the series.