Behind the scenes at The White House!

White House photographer Pete Souza opened an "Official White House Photostream" on Flickr recently. With the the marking of Obama's 100 days in office, here is a look at a collection of Souza's pictures from behind the scenes at the White House. Souza, the Chief Official White House Photographer, is on an extended leave of absence from Ohio University's School of Visual Communication where he is an assistant professor of photojournalism. He has worked as an Official White House Photographer for President Reagan, a freelancer for National Geographic, and as the national photographer for the Chicago Tribune based in their Washington bureau.

President Barack Obama jokes with senior advisors Mona Sutphen and David Axelrod during a birthday party April 15, for senior advisor Pete Rouse. Oval Office. Official White House Photo / Pete Souza

President Barack Obama and members of his staff arrive for a reception April 6, at the Dolmabahce Palace in Istanbul. Official White House Photo / Pete Souza

President Barack Obama, holding a football, offers a fist-bump April 8, to senior staff member Pete Rouse, during a meeting with senior advisors in the Oval Office. Official White House Photo / Pete Souza

President Barack Obama receives a fist-bump from a U.S. soldier as he greets hundreds of U.S. troops during his visit Tuesday, April 7, to Camp Victory, Iraq. Official White House Photo / Pete Souza

President Barack Obama is greeted by a large crowd following his Prague speech April 5, in Hradcany Square in Prague, Czech Republic. Official White House Photo / Pete Souza

President Barack Obama cheers on a young child as she rolls her egg toward the finish line Monday, April 13, during the White House Easter Egg Roll. Official White House Photo / Pete Souza

President Barack Obama and First Lady Michelle Obama participate in tree plantings at the Kenilworth Aquatic Gardens in Washington on April 21. Official White House Photo / Pete Souza

President Barack Obama makes phone calls from the Oval Office with Chief of Staff Rahm Emanuel and Assistant to the President for Legislative Affairs Phil Schiliro present on April 24. Official White House Photo / Pete Souza

President Barack Obama and Vice President Joe Biden practice their putting on the White House putting green April 24. Official White House Photo / Pete Souza

President Barack Obama walks the family dog "Bo" on a leash April 14, through the Private Residence at the White House. Official White House Photo / Pete Souza

President Barack Obama runs down the East Colonnade with family dog "Bo" on March 15. Official White House Photo / Pete Souza

President Barack Obama meets with General Raymond T. Odierno, Commanding General, Multi-National Force-Iraq, during the President's visit with U.S. troops at Camp Victory, Baghdad, Iraq on April 7.Official White House Photo / Pete Souza

President Barack Obama shares a moment with Jay Leno off set of the Tonight Show at NBC Studios, Burbank, Calif. on March 19. Official White House Photo / Pete Souza

President Barack Obama and Prime Minister Brian Cowen of Ireland attend a St. Patrick's Day lunch hosted by House Speaker Nancy Pelosi in the Rayburn Building, U.S. Capitol, Washington D.C. on March 17. Official White House Photo / Pete Souza

President Barack Obama plays with a football in the Outer Oval Office on March 4. Official White House Photo / Pete Souza

President Barack Obama looks through the Oval Office door peephole as his personal secretary Katie Johnson watches on March 12. Official White House Photo / Pete Souza

President Obama reflects during an economic meeting with advisors in the Roosevelt Room. He is seated between Senior Advisor David Axelrod and Chief of Staff Rahm Emanuel, right, on March 15. Official White House Photo / Pete Souza

President Barack Obama meets with NATO Secretary General Jaap de Hoop Scheffer in the Oval Office on March 5. Official White House Photo / Pete Souza

President Barack Obama looks at a portrait of President John Adams while waiting in the Blue Room prior to his press conference in the East Room on Feb. 9. Official White House Photo / Pete Souza

President Barack Obama meets with senior advisors in the Roosevelt Room on Feb. 16. Official White House Photo / Pete Souza

President Barack Obama visits with his daughters Malia and Sasha and kisses his wife, First Lady Michelle Obama, in a private study off the Oval Office on Feb. 2. Official White House Photo / Pete Souza

The President is applauded by House Democrats as he is introduced to speak at the House Democrats Issues Conference at the Kingsmill Resort in Williamsburg, Va. on Feb. 5. Official White House Photo / Pete Souza

President Barack Obama and Vice President Joe Biden, both seated, listen to Phil Schiliro, Assistant to the President for Legislative Affairs, right, Monday, Feb. 23, during a meeting in a conference room in the Eisenhower Executive Office Building before entering the closing session of the Fiscal Responsibility Summit. Official White House Photo / Pete Souza

President Barack Obama and First Lady Michelle Obama dance while the band Earth, Wind and Fire performs at the Governors Ball in the State Dining Room of the White House on Feb. 22. Official White House Photo / Pete Souza

President Barack Obama talks alone with Senate Majority Leader Harry Reid in the Oval Office following Bipartisan meeting on Jan. 23. Official White House Photo / Pete Souza

President Barack Obama and First Lady Michelle Obama share a private moment in a freight elevator at an Inaugural Ball. Washington, D.C. on Jan. 20. Official White House Photo / Pete Souza

President Barack Obama tries out different desk chairs in the Oval Office on Jan. 30. Official White House Photo / Pete Souza

President Barack Obama walks into the Oval Office at the White House Wednesday morning, Jan. 21, for his first full day in office. His Personal Aide Reggie Love stands nearby. Official White House Photo / Pete Souza