|Betty to the right|
|Introduced in||"Holly Jolly Secrets Part II" (pictures)|
|Latest appearance||"I Remember You" (newspaper clipping)|
Betty was a human woman revealed to have once been the fiancée of a man named Simon Petrikov, who would much later become Ice King. She and Petrikov had a very committed relationship until Petrikov obtained an enchanted crown from Northern Scandinavia, which gradually began to alter his mind and body. When Petrikov put on the crown for the first time as a practical joke, something he did terrified Betty and caused her to leave. Simon never saw her again, and he records on video his desperate wish to regain his sanity so that she might one day return to him.
Betty is an adult woman appearing to have pinkish skin and brown hair. In a picture on Simon Petrikov's wall, Betty is seen wearing glasses and a green turtle neck. In another picture, Betty is wearing a lab coat. This might suggest that she was in a field of study, such as medicine or science.
- Simon referred to Betty as his princess while he still possessed some of his sanity.
- Adam Muto stated that the figure in the picture with Simon and Betty is "some sort of cryptid." A cryptid is a creature that has been sighted before but whose existence is unconfirmed by science.
- Pendleton Ward and Rebecca Sugar have stated specifically that Betty and Dr. Princess are not the same person.
- Rebecca Sugar has stated that there are more episodes involving Betty to come in the future.