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Sydney Sweeney is a total jean -ius ... trading her real-life denim drama for some high-fashion fiction -- 'cause she just popped up on the set of "The Devil Wears Prada 2."

Onlookers spotted the actress stepping out of a trailer in the vicintity of Emily Blunt in rainy NYC Wednesday, rocking an oversized blue hoodie with the hood pulled over her face and casual bottoms -- clearly trying to keep things low-key between takes.

It’s unclear exactly why Sydney was going full incognito mode -- her role hadn't been officially confirmed before this sighting, so if she’s just making a cameo, she might’ve been trying to keep the catwalk under wraps a little longer. Getty

Or hey, maybe the hoodie was more damage control -- her American Eagle ad’s still catching heat online

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