When we first saw some of the on-set pics from upcoming film Suspiria we thought, 'oh hey, it's the guy from Up '.

But it turns out that in fact, you're looking at one of the world's most famous actresses – one who played a role in one of last year's highest-grossing films.

This actress is known for her androgynous appearance at times, but thanks to some incredible costuming and make-up work, she is completely unrecognisable here.

Advertisement - Continue Reading Below

Do you want to know who it is?

Okay, we'll tell you. It's NOT Mary-Kate and/or Ashley Olsen but instead...

Tilda Swinton!

Don't believe us? Well, how about a side-by-side comparison? Once you see them next to each other, maybe you'll be able to see it:

  © Getty Images / Splash News

Swinton will play one of the mysterious heads of an academy, in a story which flirts with rituals, witchcraft and even murder.

Suspiria is a remake of Dario Argento's classic 1977 horror film about a young ballet dancer who uncovers sinister secrets in a prestigious academy. It will also feature , Fifty Shades' Dakota Johnson, and original star Jessica Harper. Suspiriais a remake of Dario Argento's classic 1977 horror film about a young ballet dancer who uncovers sinister secrets in a prestigious academy. It will also feature Chloe Grace Moretz , Fifty Shades'Dakota Johnson, and original star Jessica Harper.

[ Tilda Swinton as The Ancient One in Doctor Strange ]

This new version of Suspiria has been This new version ofSuspiriahas been in the works since 2008 , but filming finished in February so we're finally going to be able to see it pretty soon (hopefully).

Want up-to-the-minute entertainment news and features? Just hit 'Like' on our Digital Spy Facebook page and 'Follow' on our @digitalspy Twitter account and you're all set.