The "Good Luck Chuck" babe was joined by her adoring husband Cash Warren as they schmoozed with fellow guests at the Newseum in Washington DC.
Meanwhile, Miss Panettiere, Alba's Declare Yourself partner-in-crime, was also on-hand for the stylish event which saw a guest list including the Jonas Brothers, Demi Lovato and Sarah Silverman, among others.
And today (January 20th), they'll no doubt be rejoicing as Barack Obama is installed into his new office as the President of the United States at noon.
Enjoy the pictures of Hayden Panettiere and Jessica Alba at The Huffington Post Pre-Inaugural Ball (January 19).
