Monday, Jan. 21, 2013 was a big day in Washington D.C., not only for President Obama and Vice President Biden, but also for the slew of celebs who attended their inauguration ceremony!

Performers Kelly Clarkson and Beyonce chatted up backstage, while stars like Wilmer Valderrama, Eva Longoria, Omar Epps, Marlon Wayans and more celebrated from the crowd.

Thanks to Twitter, we now know what an official Inauguration invite looks like, learned how the CNN anchors stay warm during their telecast, and are aware that Obama/Biden cookies are really a thing.

Click "Launch Gallery" above to see all of the celebs' personal the Inauguration shots ... and find out which star didn't get in!

Eva Longoria on WhoSay

Omar Epps on WhoSay

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