The Spears hit, which just turned 15 years old in May, defined new millennium pop and edged her away from bubblegum of 1999 hit “...Baby One More Time.” The single's cover was fairly innocent, but the video became source material for countless parodies and tributes.
So now, 15 years later, Spears is essentially parodying herself, and the circle is complete.
Screengrab via BritneySpearsVEVO/YouTube | Remix by Fernando Alfonso III