Arianna Jalowitz is one of the pre-made townies in La Fiesta Tech from The Sims 2: University. She can be made playable by befriending and asking her to move in, or by marrying her. Arianna has the same facial structure as Madeleine Sartor.
Arianna's name is randomized when La Fiesta Tech is generated. The name "Arianna Jalowitz" is only referenced in the game files. She is also one of the 15 pre-made members of the LFT secret society.