I do solemnly swear (or affirm) that I will faithfully execute the office of President of the United States, and will to the best of my ability, preserve, protect and defend the Constitution of the United States.
Mr Obama's oath:
I Barack Hussein Obama, do solemnly swear that I will execute the office of President of the United States faithfully and will to the best of my ability, preserve, protect and defend the Constitution of the United States, so help me God.
Check out the Latest music video of the celebrities down to this post when the Stars are with Obama, song : " Yes We Can "
Taking the oath ... Barack Obama is sworn in as the 44th US president by Supreme Court Chief Justice John Roberts in front of the Capitol in Washington.
Thanks ... US President Barack Obama, with his wife Michelle, shakes the hand of Chief Justice John Roberts after his swearing in as the US president.
Popular ... a huge crowd turned out to witness Barack Obama be sworn in as the 44th President of the United States.
Historic moment ... the Bible Mr Obama used was the same one that Abraham Lincoln used at his Inauguration in 1861.
Second in command ... Joe Biden, with his wife Jill at his side, is sworn-in as vice president of the US.
Joe leads the way ... Vice President Joe Biden kisses his wife Jill.
First kiss ... Barack Obama kisses his wife Michelle for the first time as US president.
Best of luck ... George W. Bush hugs President Barack Obama at the US Capitol.
Hands on hearts ... Joe Biden and Barack Obama sing the US National Anthem after being sworn in on the West Front of the Capitol.
Proud father ... President Barack Obama kisses his daughter Malia.
Nice one dad ... Barack Obama gets a thumbs up from his daughter Sasha after taking the Oath of Office.
Former presidents ... George W. Bush and Bill Clinton know better than anyone else what Barack Obama faces as president.
Ready to lead ... US President Barack Obama gives his inaugural address .
Family affair ... Maya Soetoro-Ng, Barack Obama's sister, right, stands with his daughters, Sasha and Malia.
Departing duo ... Outgoing US President George W. Bush stands beside a wheelchair-bound US Vice President Dick Cheney.
A quiet moment ... Barack Obama looks on during his inauguration as the 44th US president .
First ladies ... Laura Bush escorts Michelle Obama out of the White House in Washington, DC.
Big day ... Barack Obama and his wife Michelle depart Blair House to attend church before the inauguration.
End of an era ...Barack and Michelle Obama and walk with George W. Bush and Laura Bush towards a waiting Marine helicopter as they bid farewell to each other.
YES WE CAN - A New Approaches - Music video By Celebrities