AceShowbiz -

Britney Spears' unreleased song from her "In the Zone" era in 2003 has surfaced online. Some eagle-eyed fans spotted the never-before-heard track in the Spirit Music Group catalog over the weekend.

"Instant Dejavu" was registered in 2003 under an album of the same name. The track was co-penned by Rick Nowels, the hitmaker behind Belinda Carlisle's "Heaven Is a Place on Earth", Madonna's "The Power of Good-Bye" and Lana Del Rey's "Young and Beautiful" and "Summertime Sadness", and Gregg Alexander, the hitmaker behind Michelle Branch and Santana's "The Game of Love".

"When I'm making love to you, oh yeah!/ You give me instant dejavu, oh yeah!/ Don't be afraid to show it," Britney sings, "When it's real love, it's the best drug/ This is real, don't be afraid to show it!"

New #InTheZone unreleased demo in 2003:https://t.co/a55oFZqe27 pic.twitter.com/JzooeJFCYS

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— #GLORY (@FiebreBritney) August 21, 2016

Britney's upcoming album Glory, which contains previously released songs "Private Show", "Do You Wanna Come Over?" and "Clumsy", is set to be released on Friday, August 26 and is expected to make its debut at No. 1 on the Billboard 200 chart next week.