The "Gossip Girl" hunk sported a black Lacoste jacket and blue jeans with his brown loafers and scruffy face. Meanwhile, "Nashville" beauty Hayden chose a bright white jacket, black leather pants, and neon platform heels. On the other end of the spectrum, "Hunger Games" star Josh Hutcherson was very casually dressed in a gray "California" hoodie, denim jacket, and a trucker hat.
Guests at the star-studded event were treated to a performance by Lil Wayne, who thanked fans by saying, "Without you, I'm nothing."
As for the big game on Sunday, Hayden showed her support for pal Patrick Willis, tweeting a photo of her jersey with the caption, "49ers baby!!"