Yes, it's Night at the Museum fanart. I just went to see the sequel yesterday and remembered how much I love Jedediah and Octavius. XD
Also, the sequel got totally bashed by critics, but I thought it was just as funny as the original, and to my great happiness, they didn't try to lessen the tiny manlove by adding in a tiny lady or something. In fact, spoiler-neutral because it has nothing to do with the plot, they fly away in a tiny plane together at the end of the movie. SOOO CUUUTE.