Above from left; Paris Hilton in Basil Soda, Julianne Hough in Kaufman Franco and Carrie Underwood in Gomez-Gracia.

Below from left; Katy Perry in Elie Saab, Taylor Swift in Zuhair Murad and Rihanna in a custom Giorgio Armani gown. Rihanna told Ryan Seacrest on the red carpet that she wanted something “simple, sexy but gangsta.”