Lady Gaga looked so good at the Grammys, even Jennifer Lopez was stunned. The singer and A Star Is Born actress attended the award show in a metallic Celine dress with dramatic ruffles at the side. Gaga accessorized the effortlessly cool outfit with a diamond necklace and earrings by Tiffany & Co. As she walked the red carpet — striking incredible poses, per usual — J Lo stopped in her tracks to look at Gaga. The two then proceeded to pose together, making red carpet magic. See Gaga's look from all angles ahead.