Cameron Diaz and Fallon photobomb tourists in hilarious prank

Jimmy Fallon has lots of celebrity friends, as he demonstrated on his first episode of the Tonight Show - but hanging out with Cameron Diaz to prank tourists is pretty special.

Jimmy Fallon has lots of celebrity friends, as he demonstrated on his first episode of the Tonight Show - but hanging out with Cameron Diaz to prank tourists is pretty frickin' great.

Fallon decided to hang around on the roof of NBC's Rockefeller Centre - a popular tourist spot known as "Top of the Rock" - and jump in to the photos of unsuspecting tourists with Diaz.

They eat sandwiches. They wear hats. They had the craic.

Jimmy Fallon is the business. The guy rocked his own show and became an internet sensation before taking the reins of the world-famous Tonight Show, and cheerful viral stuff like this that helped.