Benedict Cumberbatch couldn't resist a photobomb when he saw band U2 posing on the Oscars 2014 red carpet.
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.
Keith Lemon couldn't resist jumping behind Celebrity Juice co-host Holly Willoughby as she posed on the red carpet at the 2012 Brit Awards.
Cara Delevingne pulled funny faces behind Sienna Miller at the Costume Institute gala's ‘Punk: Chaos to Couture’ exhibition in 2013. Sienna spotted her and laughed, then the pair posed together for the cameras afterwards.
Marion Cotillard looks on as Jennifer Lawrence rushed over behind Sarah Jessica Parker to gatecrash her photo. Sarah found it hilarious and even indulged Jennifer, who asked to touch her feathered hat.
Dustin Hoffman and Jack Black messed around when Kung Fu Panda co-star Angelina Jolie posed at the 2008 Cannes Film Festival.
Emma Thompson amused photographers when she ran up behind Oscar-winner Lupita Nyong'o and pulled faces, on the 2014 SAG awards red carpet.
Lupita Nyong'o joined in the photobombing fun as she joined fellow Oscar-winners Matthew McConnaughey and Jared Leto after the ceremony to celebrate their wins.
Beyonce made a fan's day when she photobombed her selfie during a concert in Australia.
George Clooney messed around behind Steven Spielberg during a charity gala in 2013.
Joe Jonas couldn't resist pulling faces behind his brother Joe who was sat with ex-girlfriend Demi Lovato at the 2013 Teen Choice Awards.
'Having fun backstage with @caradelevingne love you!' posted Miranda Kerr on her Instagram. The pair had just walked the Stella McCartney SS14 show at Paris Fashion Week in 2013, when Cara decided to joke around behind Miranda.
While Ellen DeGeneres and wife Portia de Rossi posed at the 2013 Grammys, Kelly Clarkson couldn't help but photobomb them. The gorgeous couple found it hilarious and posed with Kelly afterwards.
Modern Family's Jesse Tyler Ferguson hilariously gatecrashed Miranda Kerr and Orlando Bloom's photo at the 2013 Vanity Fair Oscar Party.
In a video aimed to promote healthy eating, Michelle Obama joked around behind an interview with NBA players, eating apples and even going in for a slam dunk.