The song's called "Come On Over."
Simpson says the song is "about that one love that makes you smile so big that you just gotta have it right now!"
Simpson says she's "fired up" to share her new music.
And her fans seem receptive to the new sound.
Postings on her Web site include one fan calling the song "excellent," while another says it's "awesome."
One even predicts Simpson's upcoming country album might be one of her most successful.
The new album is due out in September.
