Leona joined a host of stars, including Jamie Foxx, Gladys Knight, Smokey Robinson, Alexandra Burke and Diversity at the concert, where the performers entertained crowds on a glove-shaped stage.
Michael's three children, Prince, 14, Paris, 13, and 9-year-old Michael Joseph Jr (nicknamed Blanket), also made an appearance, with Paris donning a Thriller-style leather jacket.
Ne-Yo kicked off the show with a spot of moonwalking and a rendition of Billie Jean, while Christina Aguilera took to the stage with possibly the world's biggest hairdo.
What do you think of Leona's bow-tie and cummerbund combo? Leave a comment below...