An Unreleased Britney Spears Track From 2003 Just Leaked (AND it's Disco)

An unreleased Britney Spears demo from 2003 sprung a leak this week, straight from the pop singer's distant In The Zone era. Co-written by Grammy award-winning songwriters Nick Nowels (Lana Del Rey, Madonna) and Gregg Alexander (Sophie Ellis-Bextor, Geri Halliwell), "Instant Dejavu" is an explosive disco track with production similar to the Freemason Radio Mix of Whitney Houston's 2009 single, "Million Dollar Bill." Listen, below.