• Celebrities aren’t always aloof and stoic during press events.
  • Some of the best photos come when celebrities goof around with their famous pals and stage hilarious photobombs.
  • Here are 21 of the funniest examples.

A good photobomb can make a nice photo even better. But when celebrities get into the game, it has that extra bit of hilarity.

Whether they are popping up behind costars or friends, a lot of celebrities enjoy worming their way into photos from movie premieres to award ceremonies.

Take a look at 21 of the funniest examples below.

Brad Pitt leaped in front of Margot Robbie at the photo call for their film, “Once Upon a Time in Hollywood.”

Foto: The Quentin Tarantino-directed film stars Robbie as Sharon Tate and Pitt as Cliff Booth.sourceJordan Strauss/Invision/AP

Oscar Isaac snuck up behind Adam Driver and pretended to punch him in the back.

Foto: They attended the “Star Wars: The Force Awakens” premiere.sourceEthan Miller/Getty Images

Benedict Cumberbatch jumped up behind U2 and some others at the Academy Awards in 2014.

Foto: Cumberbatch was nominated for an Oscar the following year.sourceKevork Djansezian/Getty Images

Jared Leto loves to photobomb. Here he is behind Anne Hathaway at the 2014 Vanity Fair Oscar Party.

Foto: Leto won an Oscar for his supporting role in “Dallas Buyers Club”sourcePascal Le Segretain/Getty Images

And here he is at the 2015 Vanity Fair Oscar Party behind producer James W. Skotchdopole and friends.

Foto: There he goes.sourcePascal Le Segretain/Getty Images

And here he is popping up behind Joshua Jackson and Diane Kruger at the 2015 LACMA Art+Film Gala.

Foto: The actor had dyed his hair pink.sourceJordan Strauss/Invision/AP

But sometimes, Leto gets bested. Lupita Nyong’o popped up behind him at the 2014 Oscars.

Foto: She won for her supporting role in “12 Years a Slave.”sourceChristopher Polk/Getty Images

Rami Malek snuck up behind Portia Doubleday in 2016.

Foto: Malek and Doubleday co-starred in the USA series “Mr. Robot.”sourceMike Windle/Getty Images

Malek was also the victim of a photobomb by Chris Hardwick at the Vanity Fair Oscar Party in 2016.

Foto: Hardwick is best known as the host of AMC’s aftershow “Talking Dead.”sourceEvan Agostini/Invision/AP

Paul Rudd snuck behind Heidi Klum at the 2015 Golden Globe Awards.

Foto: Klum is a former supermodel.sourceJohn Shearer/Invision/AP

Cara Delevingne made a face behind Sienna Miller at the PUNK Met Gala in 2013.

Foto: Delevingne is an acclaimed model and actress.sourceJamie McCarthy/Getty Images for The Huffington Post

Matt Damon snuck between Justin Timberlake and Casey Affleck at the 2017 Academy Awards Nominees Luncheon.

Foto: Damon was a producer for “Manchester by the Sea,” which starred Affleck.sourceDanny Moloshok/Invision/AP

Susan Sarandon snuck up on the “Straight Outta Compton” cast at the 2016 Screen Actors Guild Awards.

Foto: The cast included Corey Hawkins, Jason Mitchell, Neil Brown Jr., Aldis Hodge, and O’Shea Jackson Jr.sourceDimitrios Kambouris/Getty Images for Turner

“Star Trek” fan Patton Oswalt photobombed Chris Pine at the 2015 Vanity Fair Oscar Party.

Foto: Oswalt was making a Vulcan salute for the “Star Trek” actor.sourcePascal Le Segretain/Getty Images

George Clooney snuck up behind Steven Spielberg, Jessica Seinfeld, and Jerry Seinfeld at the 2013 USC Shoah Foundation Gala.

Foto: The gala honors individuals with the Ambassadors for Humanity Award.sourceLarry Busacca/Getty Images for the USC Shoah Foundation Institute

Aaron Paul popped up behind Bryan Cranston at the 2013 Emmy Awards.

Foto: Paul and Cranston co-starred in AMC’s “Breaking Bad.”sourceKevork Djansezian/Getty Images

Kelly Clarkson was excited about sitting behind Portia de Rossi and Ellen DeGeneres at the 2013 Grammy Awards.

Foto: De Rossi and DeGeneres have been married since 2008.sourceChristopher Polk/Getty Images for NARAS

January Jones and Kiernan Shipka were photobombed by Jon Hamm at the AMC Holiday Party in 2014.

Foto: All three were “Mad Men” stars.sourceJohn Shearer/Invision for AMC/AP Images

Seth Green made a shocked face behind TIm Gunn as he took a photo at the 2014 Emmy Awards.

Foto: Gunn was a fan-favorite star of “Project Runway” on Bravo.sourceJohn Shearer/Invision for the Television Academy/AP Images

Elaine Hendrix made a face behind Kirsten Dunst at the second season premiere of “Fargo” in 2015.

Foto: Kirsten Dunst starred on “Fargo’s” second season.sourceRichard Shotwell/Invision/AP

Justin Timberlake made some moves behind Jessica Biel at the 2017 Oscars.

Foto: The pair have been married since 2012.sourceJordan Strauss/Invision/AP