Katy Perry & John Mayer! Alicia Keys! Barack & Michelle Obama! Best of the Inauguration Twitpics!

If there's any opportune moment to post a super-cool Instagram, it's definitely while you're partying with the president.   Celebs that were lucky enough to attend...

Source: http://feeds.eonline.com/~r/eonline/ca/topstories/~3/822bgafq9Qo/katy-perry-john-mayer-alicia-keys-barack-michelle-obama-best-of-the-inauguration-twitpics

Jaime Pressly Jamie Chung Jamie Gunns Jamie Lynn Sigler Janet Jackson