Grammys weekend kicked off by honoring the most iconic diva of them all — the one and only Mariah Carey!

The singer-songwriter was shining on the red carpet at Friday’s MusiCares Person of the Year Gala in Los Angeles … commanding attention in a sheer floral dress with a corseted bodice.

She layered on the bling with a diamond collar necklace, stacked diamond bracelets and waterfall diamond earrings … though no jewelry could shine as bright as her A-list smile.

Plenty of stars showed up to support Mariah as she was awarded the Person of the Year honor … with the likes of Kesha, Dove Cameron, and Charlie Puth infusing the affair with a little extra star power.

Inside the signature Grammy event, myriad musicians took the stage to honor the “Obsessed” hitmaker … including Jennifer Hudson, who gave her all while belting out MC’s hit track “My All.”

Taylor Momsen and the Foo Fighters opted for alt-rock instead of pop … reminding everyone Mariah went through a secret rock star phase with the band Chick in the 1990s!

While performances kept the energy high, none of them could match the moment everyone was waiting for … Mariah’s acceptance speech — where she thanked a ton of people and called the outpouring of love “overwhelming.”