Madonna stepped off the stage after her Paris concert on Wednesday night and headed to another performance.
But unlike her sold-out show at the AccorHotels Arena, this one had just a small crowd of onlookers, swaying and snapping photos with their cell phones.
It started with an announcement the Material Girl sent to fans on Twitter, inviting them to the Place de la Republique, the site of a memorial to victims of the November 13 terrorist attacks.
It wasn't long before a crowd gathered, and social media posts showed up featuring video and photographs of the singer belting out her own songs and other classics, such as John Lennon's "Imagine.