"Mirren, Mirren on the wall ..."

There's little denying that Helen Mirren seems like she's got all the answers -- how to make it in Hollywood, how to age gracefully, how to say salty things without coming off as crass, etc. -- so it should come as no surprise that 'Tonight Show' host Jimmy Fallon turned to her for some guidance on last night's show ... with costumes, of course.

Mirren gamely took on the challenge, posing as a 'Snow White'-styled mirror (er, Mirren) while Little Lord Fallon sought her guidance on all sorts of matters, from what to order at Subway to marijuana legalization to, yes, what Mirren thinks of '50 Shades of Grey.' The actress issued what is, quite possibly, the most cheeky and adept answer to that question yet.