trouble finding song

this song was on country radio during the summer 08. it was upbeat sung by a girl and had something to do with hearing a song on the radio and wanting to know who sang it (ironic). im pretty sure there was a line about playing air guitar...anyone know what the song is?

I believe it's called "That Song in My Head" by Julianne Hough

It was a sweet Southern soulful thing
That got me down deep
You caught me starin' at you
But you smiled back at me
Started slingin' that air guitar
Man, you sure can play
And I've had that song in my head all day

(I) don't know who sings it
I keep searchin' the radio
I just wanna hear it