In need of some contagious laughter? We've rounded up the best celebrity laugh moments — from Ricky Gervais's famous guffaw to Bradley Cooper's giggle fit [1] — and we can guarantee that they will instantly put you in a good mood. Keep reading to watch stars break out into infectious laughter, and don't forget to check out more must-see viral videos [2].

Source: Getty / Desiree Navarro [3]

Jake Gyllenhaal Laughing at Big Hands

Bradley Cooper and Jimmy Fallon Laughing at Their Hats

Ricky Gervais Laughing at Everything

Zach Galifianakis Laughing at the Term "Porky's Butthole" (Starts at 4:10)

Ryan Gosling Laughing at the "Hey Girl" Meme

Nick Offerman's Girlish Giggle (at 0:24)

Seth Rogen's Laugh. All of It.

George Clooney Laughing at His Own Gwyneth Paltrow Joke

Brad Pitt Losing It With Jonah Hill

Jennifer Lawrence Giggling Through Box of Lies

Steve Carell Laughing at Kristen Wiig (at 5:35)