text: Uh, no, Ashlee Simpson has not been featured on Gilmore Girls before.\nThat depends which "La La" song you are meaning, there are 4, all of which are on the Gilmore Girls Soundtrack. The songs that go "La La" are called Waltz #1, Getting Married, Maybe Next Week, and Rory and Lane. Each has a different beat and rhythm, but all our performed by Sam Phillips.