The 'Bad Neighbours' star doesn't have a problem with his older sibling, 36, sharing revealing snaps on Instagram because he admires his confidence and carefree attitude.
Speaking to The Daily Beast, Dave, 29, said: "I know better than to tell him what to do with regard to anything at this point. What a lot of people think is crazy is also what I admire about him: He does what he wants, and he's not afraid of how people are going to perceive him.
"Someone in his position who will put himself out on a limb like that, I think it's refreshing. So I'm not the one to tell him to stop posting naked pictures of himself on Instagram - not that I'm necessarily rushing to check these pictures out - but he can do what he wants."
Despite his admiration for James, the hunky actor insists he won't be joining him on the photo-sharing site any time soon because he prefers to keep his life private.
He explained: "It [social networking] all overwhelms me a little bit. I'd feel the pressure to constantly be posting something funny or interesting. But I don't know. I've stayed away this long ... On top of everything, I do value whatever anonymity I have left and I like to have a private life and keep things as private as possible."