Obama delivered an inauguration speech that focused on togetherness and equality for all American citizens. If you missed it, check out his full speech in the video posted above.
While attending the service, Obama apparently took a moment to send a message to his supporters, tweeting: 'I'm honored and grateful that we have a chance to finish what we started. Our work begins today. Let's go. -bo.'
Vice President Joe Biden, sporting a pair of suave aviator sunglasses, also attended the service with his wife Jill.
On Sunday night, the Obamas attended a glitzy reception in Washington D.C. with Biden and wife Jill. The event at the National Building Museum to celebrate those who supported the campaign and benefactors of the Presidential Inaugural Committee.
Michelle looked glamorous in a sequined, black cocktail dress and statement earrings while Dr Biden wore a navy blue dress with a bold necklace.
Obama thanked his many donors for their support at the event and said his second inauguration is a celebration of the country and its citizens, not the election results.
Beyonce' did a great job of singing the National Anthem...
Kelly Clarkson also performed a decent rendition of "My Country, Tis of Thee"...