Stars went glam in statement-making floor-length gowns for the charity gala.
Exuding a sexier vibe, Kate Mara and Selita Ebanks opted for a more classic holiday hue in floor-skimming crimson styles.
On the other end of the spectrum, Girls‘ Allison Williams went with another long lace gown in a pastel hue that lent a romantic feel to the elegant silhouette.
Click through the gallery to see all the stylish stars at the UNICEF ball — and who wore what.
Who do you think was the belle of the ball? Share your favorite look below.
See what Katy Perry and the other stars at the charity gala had to say on the red carpet.
No changes are to be made to this player