No, this is not an after-effect of Hermione Granger's Time-Turner.

For her latest film, "My Week With Marilyn," Emma Watson cuts a fine '50s form as Lucy, a wardrobe assistant toiling on the Ms. Monroe's movie "The Prince and the Showgirl."

Co-starring Michelle Williams (as Marilyn) and Eddie Redmayne (as Colin Clark), the biopic is based on Colin's account of the on-set strife between Marilyn and fellow actor Laurence Olivier.

Now, this first post-"Harry Potter" part may be a small one for Emma (she shot for only a few days to avoid conflicts with her studies at Brown University), but it's one of a couple upcoming roles we're looking forward to. After she spends a week with Marilyn, Emma will hit the books as angsty teen Sam in the big-screen adaptation of Stephen Chbosky's "The Perks of Being a Wallflower."

"My Week With Marilyn" opens November 23.

Are you excited for "My Week With Marilyn"? Tell us in the comments and on Twitter!