Newly-engaged Kelly Clarkson was also on hand to perform at the concert and the 30-year-old wasn't shy about showing off her huge yellow diamond.
The American Idol winner accessorised her ring with a stunning floor-length dress, complete with an intricate patchwork design.
Other stars of the night included Demi Lovato looking demure in a little black dress and Jordin Sparks, who went for full-on glamour in a dress with a thigh-high slit.