Out of their seats and busting some moves with wild abandon, the couple were clearly lost in music.
A regular sight at a rock concert, maybe - but the two spectators at the Monaco Live Music event weren't your average gig-goers, they were newly-engaged Prince Albert of Monaco and Charlene Wittstock.
The last time they were pictured together – in the official portrait to celebrate their engagement - they looked serene and calm.
But that image couldn't have been more different from the scene which unfolded at the Prince's Palace Square, Monte Carlo where the couple shimmied around the VIP box to the tunes of Iggy Pop and ZZ top, bumping hips and cheering wildly.
The one constant however, was the couple's obvious happiness and delight in each other's company.
And eagle-eyed royal fans may have picked out the most tender of moments when, in the midst of the action, Charlene grabbed her beloved's shoulders and plant a tender kiss on the back of his neck.
The fun-filled scene - during which Albert's sister Princess Caroline also got down to the serious business of boogying - speaks volumes about the pair.
Despite their high standing position, they are far from pretentious. Their shared playful nature is something that clearly brings them close together and points to many happy years to come.
Even their similar outfits – both arrived dressed in rock-appropriate black – points to their duality.
Charlene, who didn't stop smiling for a moment, looked thrilled to meet Iggy Pop at the gig. The future princess – her hair styled into a funky quiff – also joined her fiancé to pose for a picture with blues rock legends ZZ Top.