Diana Ross celebrated her 75th birthday on Tuesday, and was surprised with an unplanned performance from fellow diva Beyoncé.

In a video shot by Khloe Kardashian, which she shared on her Instagram story Tuesday evening, Ross’s daughter, Tracee Ellis Ross, is seen looking to get someone to sing “Happy Birthday” to the birthday girl and realized that Beyonce was still standing near the huge cake.

“Beyonce? Are you still here?” Tracee asked over the mic. “Do you want to sing ‘Happy Birthday?’ Come on down!

Wearing her hair down in a long braided ponytail, Beyonce glowed as she took the mic and began to sing the iconic tune, and adding her own sultry twist to the vocal style which brought the song to life.

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In another video taken by one of the guests, Beyonce can be seen singing the celebratory song directly to the legendary Motown singer, while Diddy stands beside her, smiling at the special moment.

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But Beyonce wasn’t the only one who got to share a magical moment with Ross, as Diddy and his twin daughters D’Lila Star and Jessie James, also performed during the night. They danced along to Notorious B.I.G.‘s 1997 hit “Mo Money Mo Problems,” of which the song sampled Ross’ 1980 record, “I’m Coming Out.”

During the big night, Ross also welcomed Kris Jenner, Kourtney and Khloe Kardashian to dance with her as she performed.

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The celebration in Ross’s honor was held at the Warwick in Los Angeles, California, and included many star-studded guests, from Berry Gordy and Robin Thicke to Ross’s son and daughter-in-law Evan Ross and Ashlee Simpson, among many others.

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