Jasmine is the Arabian princess from Agrabah, who Aladdin the hot homeless boy falls in love with in Aladdin. They have the best love duet in all Disney movies, 'A Whole New World'. Jasmine is the only princess to not wear a dress at the parks now that Ariel's no longer in mermaid form.
Jasmine can be found at Magic Kingdom in Adventureland, at Epcot in fake Morocco, and at Hollywood Studios at the Art of Animation on nights when Fantasmic isn't playing. I've also heard rumors that she's sometimes at 'Akershus' in fake Norway or 'Cinderella's Royal Table' at the Magic Kingdom, but have no proof. She is almost always with Aladdin.