Celebs taking selfies – Television personalities Kim Kardashian and Willie Geist take a selfie during "The Tonight Show with Jay Leno."
Celebs taking selfies – Denmark's Prime Minister Helle Thorning-Schmidt snaps a selfie with British Prime Minister David Cameron and U.S. President Barack Obama during the memorial service of former South African President Nelson Mandela in Johannesburg on Tuesday, December 10.
Celebs taking selfies – Tom Hanks takes a selfie with fellow actor Steve Martin at the 2013 Governors Awards.
Celebs taking selfies – Track star Usain Bolt takes a picture of himself under the Christ the Redeemer statue in Rio de Janeiro. Oxford defines a selfie as "a photograph that one has taken of oneself, typically one taken with a smartphone or webcam and uploaded to a social media website."
Celebs taking selfies – Singer Justin Bieber takes a selfie with a fan before appearing on NBC's "Today" show.
Celebs taking selfies – Actress Angelina Jolie takes a photo of herself with a fan's camera at the Paris premiere of "World War Z."
Celebs taking selfies – Actress Meryl Streep takes a photo of herself and Hillary Clinton after Clinton hosted a dinner for the Kennedy Center honorees in Washington.
Celebs taking selfies – Even political figures are getting in on the trend. Here, British Prime Minister David Cameron takes a photograph with Olympic volunteer Anita Akuwudike in London.
Celebs taking selfies – Actor Ashton Kutcher poses in the audience during the 2010 People's Choice Awards.
Celebs taking selfies – Now-retired tennis player Kim Clijsters takes a selfie with Caroline Wozniacki during an exhibition match in Hua Hin, Thailand.
Celebs taking selfies – Actor Josh Duhamel takes a selfie at the Empire State Building in New York City.
Celebs taking selfies – Actor Bradley Cooper poses for selfies with eager fans at the Los Angeles premiere of "The Hangover Part III."
Celebs taking selfies – Kathie Lee Gifford, Kris Jenner and Hoda Kotb pose for a selfie on NBC's "Today" show.
Celebs taking selfies – Selfies don't always have to be with other people. Director Zack Snyder takes a photo of himself in front of Action Comics No. 1 at the Superman 75 party in San Diego.