As you can see, it's quite a striking change from her usual long look.
This comes after her turn in the big-screen tearjerker The Whale, opposite eventual Oscar-winner Brendan Fraser.
But back on the show that catapulted Sink's career, the '80s-set sci-fi Stranger Things, she's ready for action when its fifth and final season arrives – though her character Max Mayfield currently lies in a coma.
"I would like to see her awake," she said on The Tonight Show Starring Jimmy Fallon. "I want to know if I have to get back in a body cast, I would like for that chapter to be closed."
Weighing into the fifth season more broadly, she also revealed earlier this year: "It's going to be emotional, I'm sure. It's going to be awful. It's going to be horrible. These kids, this entire cast and crew, it's family.
"People say that all the time, but I genuinely mean it. And to think that we have to say goodbye to that security and knowing that we're not going to be seeing each other for another season? But I think it's exciting to kind of move on to the next chapter, I guess."
If Fraser's words are anything to go by, the world is truly Sink's oyster.
"This kid is so good," he exclusively told Digital Spy during promotion for The Whale. "Her talent precedes her years of experience.
"I watched her every day just get the gold star in every way that I have not seen a young actor know how to be that precise, that inventive; how to be that consistent; to have that perfect elocution without being affected."
Stranger Things seasons 1-4 are now streaming worldwide on Netflix.
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