Hayden Panettiere, Jessica Alba at Inaugural Ball

Barack Obama will be sworn in as President of the United States within the hour, and many celebrities have joined the millions of people in D.C. for the occasion.

Last night, we brought you photos of various Obama fans. Now, here's a look at one of the future Chief Executive's biggest fans, rocking her new bob hairstyle:

Click to enlarge more photos of Jessica Alba - and Heroes star Hayden Panettiere - leaving the Huffington Post Inaugural Ball at Newseum in Washington DC ...