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Legendary Motown singer and artist Diana Ross fêted her 75th birthday with a glamorous and celebrity-filled extravaganza where Beyoncé sang her “Happy Birthday.”

In a close-up video posted on The Shade Room’s Instagram, Beyoncé hopped on the mic to sing a stripped-down version of the classic song to the R&B diva. Ross stunned in a sequined silver outfit and her signature curls were free and on full display that evening. Bey looked glamorous with her long sleeved dress, chandelier earrings, and long blonde hair in a high ponytail.

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Diddy, Ashlee Simpson Ross (wife of Diana’s son Evan Ross), and other loved ones and friends of the singer were up-close and center for the special moment.

Khloé Kardashian was also in the audience and captured the scene standing behind a few dozen camera phones. A fan account caught Leonardo DiCaprio (dressed in a newsboy cap, hoodie, and jeans) showing birthday love to Ross. The Oscar winner escorted Ross to the stage and he looked elated when he said: “Happy birthday to the legend, Miss. Diana Ross!”