What is this song???? please help!?

all i know is that its a very simple sounding sog and its a female vocalist and i think in the chorus she says: ah ah ah ah ah ah ah ah ah ah ah ah aha. either that or she says: im in luh uh uh uh uh uh uh uh uh uh uh uh uv. idk... please help !!! i really like it but i dont know what its called or who its by!!