'Sons of Anarchy's' Charlie Hunnam is adorable in 'Pacific Rim' blooper reel

The stars of "Pacific Rim" seemed to have had quite a bit of fun making the summer blockbuster. "Sons of Anarchy" stars Charlie Hunnam and Ron Perlman, and "It's Always Sunny in Philadelphia's" Charlie Day shared plenty of laughs on the set, according to a recently released blooper reel from the film.

The video, which was found by io9, seems to be from "Pacific Rim's" forthcoming DVD and Blu-ray. In it, Hunnam adorably trips while walking up the stairs and Day and Perlman goof off in their scenes together.

"Pacific Rim" was released on July 12 and went on to make $407 million worldwide. Following his starring role in this film, Hunnam went on to sign on to "Fifty Shades of Grey." "Pacific Rim" is coming out on Blu-ray 3D, Blu-ray and DVD on Oct. 15.

Photo/Video credit: Warner Bros.