The very surprising stars of 2013

The very surprising stars of 2013! From the unwanted engagement shoot extra to stars who can't say no to a camera, the year’s best photobombs compiled by Tumblr

• It's a craze that only got crazier this year, with sabotaged photos much more popular than proper ones
• So from Queen B to 1D, here are the best Photobombs of 2013 according to Tumblr

It is said that to be a truly great photobomber you must first be an artist.
So in a year when the art of photobombing was added to the Oxford Dictionary ('a photograph that has been spoiled by the unexpected appearance of an unintended subject in the camera’s field of view as the picture was taken') it should come as little surprise that some of the best spoiled photos came from celebrities.
In Hollywood, photobombing has become a tit-for-tat game amongs the stars, especially at big awards events, when the opportunities to intrude a photo are endless in a sea of cameras.
Micro-blogging website Tumblr has developed a list of the best (read: funniest) photobombs of 2013.

Nice: Kelly Clarkson comes out of nowhere as a photographer takes a couples shot of Portia de Rossie and Ellen DeGeneres at the Grammy Awards in Los Angeles on February 10

You bombed The Don? Rap artist Tyler, The Creator (right) intrudes on a photo of Donald Trump with a fan (left) backstage at Late Night With Jimmy Fallon

How ... sweet? A couple enjoying a romantic moment - and photo - get caught out

Cheeky, cheeky: One Direction's resident practical joker Niall Horan (back) jumps into a fan shot being taken of Harry Styles

Arguably the most famous of the year: During a concert, Beyonce notices a fan taking a selfie and ducks down to be part of it

Gotcha: Known for clowning around, Jennifer Lawrence seizes upon a bomb opportunity behind Sarah Jessica Parker at the Met Museum Gala in New York City

Peekaboo: Michael Douglas ensures he's included in a photo with wife Catherine Zeta-Jones (left) and Angelina Jolie at the Golden Globe Awards in January

My turn, Mommy: Alicia Keys (right) takes a photo with indie songstress Lorde backstage at the ARIA Awards in Sydney in December while her son, Egypt, pops up in the background

Cheeky Malia Obama crashes sister Sasha's picture after the pair made their parents kiss for the camera several times over earlier this year

Horsing around: A mare flashes a toothy grin behind this charming picture of the bride and bridesmaids

Tumblr has made it clear that the list is not final, as there are still a few more days to go until 2014.
So get bombing!