The video was caught by Khloe Kardashian on her Instagram Story, and Beyonce sounds amazing!
“Beyonce? Are you still here?” Tracee Ellis Ross could be heard saying while giving a speech to her mom. “Do you want to sing ‘Happy Birthday?’ Come on down!”
Then, Beyonce stood in the center of the room and sang a gorgeous, acapella rendition of the song to the legendary entertainer.
Watch the video below!