Ms. Pig is the gender-swapped version of Mr. Pig who appears in "Bad Little Boy." She appears in the crowd, cheering to Fionna and Marshall Lee. She is also seen next to Male Tree Trunks when the party begins.
She looks just like Mr. Pig, except she is a girl and has a small dark blue bow on top of her head and eyelashes.
- Ms. Pig and Male Tree Trunks standing next to each other when dancing is a reference to their gender-swapped counterparts' relationship in "Dream of Love."