History is made as Obama is sworn in as the 44th President of the United States.
Diddy seems to be seeking silence as the inauguration gets underway in D.C.
The power couple, along with millions of their closest friends, witness the inauguration in the nation's capital.
The director and his actress wife listen intently as Obama delivers his inauguration speech.
The teen pop star represents the 2012 reelection voters at the Kids' Inaugural: We Are the Future concert Monday night, televised on the Disney Channel (natch) from the Verizon Center in Washington D.C.
The hip-hopster brings the house down (along with a little help from Beyoncé, not pictured) while performing in Washington, D.C., at the Eve of Change concert on the, well, eve of the inauguration.
After performing at the Kids' Inaugural concert, Joe, Nick and Kevin celebrate the historic weekend with many of their fans' parents at the Huffington Post's Pre-Inaugural Ball at D.C.'s Newseum.
The next leader of the nation spoke at the We Are One pre-inaugural concert before a memorial to another notable Illinois politician and president, Abraham Lincoln.
Partying for the new Commander-In-Chief, Jessica and Jamie do their bit at the pre-inaugural Tropicana bash at the Renaissance Washington Hotel.
This powerhouse trio lends their star wattage to the Latino Inaugural Gala celebrating change at Union Station in Washington, D.C.
Setting aside, if not settling, any personal issues, LiLo and SamRo party for the cause at the A New Birth of Citizenship pre-inaugural bash presented by Declare Yourself in the Renaissance Washington Hotel's Grand Ballroom.
The country music king delivered a rocking version of "American Pie," not to mention a rousing bit of the party anthem "Shout" at the We Are One concert.
Hungry for change and eager to help those who are just plain hungry, the Oscar-winning actorvist attends the National Hunger Rally pre-inaugural event hosted by Feeding America at the Martin Luther King Library in Washington, D.C.
The Boss kicked off the weekend's We Are One event, performing a raspy "The Rising" with a soaring gospel choir.
The A-List marrieds rise early to address a pre-inaugural breakfast promoting the Entertainment Industry Foundation and ServiceNation's "A New Era of Service" event at Ballou Senior High School in Washington, DC, the day before the inauguration.
The singer known as Sasha Fierce delivered a stirring performance of "America the Beautiful" at the We Are One event.
Since the soon-to-be first family has yet to decide on a family dog, this cute canine gets our vote as he strikes a patriotic pose with the actress at Pepsi's Pre-Inaugural Celebration in Hollywood.
The two Democratic Party boosters teamed up to perform Bob Marley's "One Love" in front of the Lincoln Monument the pre-inaugural We Are One event.
Here's hoping the new president will look for ways to whack out hunger, like the reality-show star made an effort to do at Pepsi's Pre-Inaugural Celebration, which brought together celebs on behalf of Feeding America.
The band tore through "Pride (In the Name of Love)," their anthem dedicated to Dr. Martin Luther King.
The (soon-to-be) First Family enjoyed the moment, watching, laughing and taking pictures.
When she sings "Lean on Me," you know she means it.
The Oscar winner and funnyman was one of many notable celebs to speak at the celebrations.
First co-starring with Golden Globes winner Mickey Rourke and now hanging with the next leader of the free world? Tomei is doing all right for herself.