Sim, and Tri-Fruhm Sorority member studying Psychology in Freshman year at La Fiesta Tech. She is the only member of the sorority not to be friends with any of her housemates. This is possibly because her crush on Sarah's boyfriend Matthew creates some tension within the household. However a friendship between should be very easy to develop, as they both share the same interests.
Her surname might be intended as a hint that she intends to "pilfer" (i.e. steal) Matthew's affections from Sarah. Her portrait picture is also the default picture in The Sims 3 for a Sim that has broken data. Jessie is 54 hours away from the final exam in her first semester, when the sorority is first played. Like several other Sims from La Fiesta Tech, she starts off with no gender preference.