X17 caught up with Russell Brand Wednesday night as he left the famous Arclight Cinema in Hollywood, and mum was the word for the famous Brit!

Brand wouldn't address recent rumors that he and wife Katy Perry are on the rocks. Actually, our fav thing about the video is that, as unusually quiet as Russell was ... the Arclight security guards were twice as vocal.

They're really taking the word "guard" to a whole new level ... watch our vid above to see what we mean!

On the bright side, MTV's VMA nominations were announced Thursday, and Perry got the most noms -- nine! See what she Tweeted about the news after the jump ... it might explain why Russell was at the movies alone ...