Jessie J going all old Hollywood in this Ralph and Russo ensemble

Rihanna reminiscent of all the prom dresses you wore in this Giambattista Valli puff cloud of a dress

Kim Kardashian taking a risk with a Jean Paul Gaultier, although we're wondering what she's wearing underneath we have to say it looks very good on her!

Jennifer Hudson who is also wearing a Tom Ford looks simple and very feminine

Taylor Swift looking fabulous in this Elie Saab teal dress

Anna Kendrick, opting for a less traditional look with this suit created by the fashion house, Band of Outsiders. Paired up with a pair of pretty heels, she looked super stellar!