Cara Delevingne is a pro at the perfect photobomb. At the Costume Institute gala's Punk: Chaos to Couture exhibition in 2013, she pulled funny faces behind Sienna Miller before being spotted.
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Beyonce made a fan's day when she crashed her selfie during a concert in Australia.
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The Queen delighted a group of Australian hockey players when she gave their selfie the royal seal of approval at the Commonwealth Games earlier this year.
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Prince Harry jokingly posed behind three New Zealand Commonwealth Games officials who were capturing their attendance on film.
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Prince William joined the royal photobomb phenomenon when he smiled over the shoulder of cyclist Chris Hoy.
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In this amusing snap, award-winning actor Kevin Spacey interrupted a tourist's photograph as he passed her while running.
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Known joker George Clooney clowned around behind Steven Spielberg, Jerry Seinfield and Jerry's wife during a charity gala in 2013.
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Marion Cotillard was in stitches as red carpet comedian Jennifer Lawrence rushed over to Sarah Jessica Parker to crash her photo at the 2013 Met Gala.
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Benedict Cumberbatch's effort may be the most talked-about all year. The Sherlock actor couldn't resist a photobomb when he saw band U2 posing on the Oscars 2014 red carpet.
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Sneaky Bill Murray stopped behind Selena Gomez at this year's Vanity Fair Oscars Party.
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Joe Jonas couldn't resist making faces behind his brother Nick who was sat with Demi Lovato at the 2013 Teen Choice Awards.
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Emma Thompson captured the spirit of the photobomb as she snuck up behind Lupita Nyong'o on the 2014 SAG awards red carpet.
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Lupita Nyong'o joined in the photobombing fun as she crept up behind fellow Oscar-winners Matthew McConaughey and Jared Leto after the ceremony.
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Supermodel Gisele Bundchen made this funny face behind Oscar winner Anne Hathaway as the actress showed off her accessories at this year's Met Gala.
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These two funny ladies are always mocking each other, but it was Tina Fey who inched in on friend Amy Poehler during the 2012 Golden Globes telecast when Amy's name was read out for Best Actress in a Comedy.
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While Ellen DeGeneres and wife Portia de Rossi posed at the 2013 Grammys, Kelly Clarkson couldn't help but photobomb them. The pair found it hilarious and grabbed Kelly for a photo afterwards.
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Ringo Starr made for an unlikely photobomber in 2010 when he jumped behind Justin Bieber and Kesha.
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Jared Leto, who won an Oscar for Best Actor in a Supporting Role in 2014, startled Anne Hathaway after he jumped behind her on the red carpet.
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Modern Family's Jesse Tyler Ferguson hilariously crashed Miranda Kerr and Orlando Bloom's photo at the 2013 Vanity Fair Oscar Party.
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Jane Fonda channeled Miley Cyrus when she photobombed Carly Simon and Melanie Griffiths's sweet reunion at a gala in 2013.
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Karlie Kloss jumped into this snap of designers Michelle Ochs and Carly Cushnie, the ladies behind Cushnie et Ochs.
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Sir Paul McCartney decided to give British socialite Poppy Delevingne a pair of bunny ears when he walked past her at the Oscars this year.
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It was hard to tell if Johnny Depp was hiding or photobombing director Tim Burton during a press call for Alice in Wonderland in 2010.
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Lady Gaga nearly got upstaged by Kermit the Frog in 2009 when the green muppet photobombed the singer from inside their car.
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In a video aimed to promote healthy eating, first lady Michelle Obama joked around behind an interview with NBA players, eating apples and even going in for a slam dunk.
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Castle star Nathan Fillion photobombed Ellen Page and director James Gunn at the premiere for Super in 2011.
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Zach Braff gave these newlyweds a wedding photo to remember when he stopped on the cross walk in Times Square where the pair were being photographed.
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Siva Kaneswaran sneakily got into this silly photo of his former The Wanted bandmate Max George and pal Jessie J.
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Rod Stewart added extra star power to one fan's photo of himself with Billy Connolly.
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Seth Green covertly hid behind his co-star Amanda Crewat the premiere of The Identical in 2014.
