Barack Obama is the 44th and current president of the United States, and the first African American to serve as U.S. president. First elected to the presidency in 2008, he won a second term in 2012.

When Hillary Clinton was elected to the U.S. Senate in 2001, she became the only American first lady to hold national office. She became the 67th U.S. secretary of state in 2009, serving until 2013.

Nicolas Sarkozy served as France's 23rd president from 2007 to 2012. His term was marked by controversy, which included his marriage to Carla Bruni in 2008.

Pippa Middleton is best known as the younger sister of Kate Middleton, the Duchess of Cambridge and wife of Prince Charles.

Former Delaware Senator Joe Biden was elected the 47th U.S. vice president with President Barack Obama in 2008. He earned a second term as vice president when Obama was re-elected to the presidency in 2012.

Al Green is known for the hit song "Let's Stay Together," and for leaving his musical career at its height in the 1970s to become a reverend at his own church.

Kate Middleton, Her Royal Highness the Duchess of Cambridge, married Prince William in 2011 at Westminster Abbey. She will not be a princess until Prince Charles inherits the throne.

Barack Obama is the 44th and current president of the United States, and the first African American to serve as U.S. president. First elected to the presidency in 2008, he won a second term in 2012.

Oscar-winning director James Cameron is best known for the highly acclaimed, box-office hits Aliens (1986), Titanic (1997) and Avatar (2009).

John Edwards served in the U.S. Senate from 1998 to 2004. He was the Democratic vice-presidential nominee in the 2004 election, and twice ran for president.