Jessie J's Original 'Party In The USA' Demo Leaks Online - Audio

The 'LaserLight' singer's original version of Miley Cyrus' hit single has been posted on the internet.

Jessie J's original demo version of 'Party in The USA' has been posted online for the first time by the song's co-writer Claude Kelly.

The 'Domino' star and regular collaborator Claude penned the song back in 2009 for US pop star Miley Cyrus, and the songwriter has now shared a snippet of Jessie's original version while reminiscing about the past.

"In the studio with Jessie J reminiscing about how it ALL got started," Claude posted this week, reports Idolator. "This is the first song we ever did, I guess we did ok, right?

"The lyrics are slightly different and Jessie, who's well known for her prodigious vocal abilities, can really belt - but you really can't win over Cyrus' swaggerific original."

The Dr. Luke produced hit became a huge hit for Miley upon its release and has since become one of her signature songs.

Jessie is currently working hard on her second studio album, the follow-up to 2011's 'Who You Are', and sparked speculation she is working with Fazer on the release after sharing a picture of the two in the studio together.

Check out a picture of Jessie J and Fazer in the studio together recently below (Credit: Twitter):

Last week, Jessie also issued a Twitter plea to all of her fans not to live through the social networking site and to get out into the world to make friends.

Jessie J is expected to release her new album later this year before heading out on tour in October.

Listen to a demo of Jessie J's version of 'Party In The USA' below: