René-Charles Angélil, Celine Dion’s eldest son, secretly married in a lovely and highly intimate wedding.

However, an unexpected and soul-shaking surprise turned this modest celebration into an iconic moment in music history: Celine’s longtime friend and vocal soulmate, Josh Groban, emerged from the shadows to perform a surprise duet with the bride’s mother.

The wedding was held at a secluded home just outside of Montreal, with just the closest friends and family in attendance—no photographers, press, or spectacle.

Dion, 56, seemed ethereal in soft gold silk and diamonds from her late husband René’s collection and was believed to be extremely emotional from the outset.

But nothing could have prepared the guests, or the bride and groom, for what came next.

As the pair performed their first dance, the lights lowered. A solitary spotlight landed on the rear of the room.

Josh Groban, famed for his powerful voice and moving performances, walked forward, eliciting gasps from the audience.

The music intensified. And then Celine joined him.

They played a never-before-heard original love ballad titled “Forever Begins Tonight”—a present made for the newlyweds.

The whole room burst into tears as they sang.

The last note faded, leaving even Celine, a pillar of grace and perseverance through recent years of personal adversity, speechless. She sat quietly, her eyes full of shimmering tears.