Never heard of Jack in the box

I would pick Burger King, of course. I can imagine her doing a Burger King commercial with something like one that Emmanuel Lewis did in 1984: she’s lying on a couch out by the pool, and says that since she became a star, she doesn’t have time to go to Burger King as much as she used to, and instead spends a lot of time thinking about a tasty Original Chicken Sandwich. Then, while she’s thinking about it, a butler comes up with a Burger King bag and a soda on a tray, and says, “Your Original Chicken Sandwich, Miss Tanner”. Stephanie wakes up, and upon seeing exactly what she had dreamed about, says, “Of course, being a star does have its advantages” and laughs a little.

Pretty awesome, of course. :)