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They've certainly grown up - Remember when they were all so little?

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Millie Bobby Brown - Millie plays Eleven on the show. The teen Brit usually shows off her personality through her looks.

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Millie Bobby Brown - Bold and creative, the young actress invests in diverse outfits, with lots of details and sparkle.

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Millie Bobby Brown - Despite wearing few accessories, whenever she wants to add a touch to an outfit, she opts for her trademark sunglasses.

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Millie Bobby Brown - Special outfits for special events. At the MTV VMAs, she wore a loose black transparent dress with metallic details. The black boots add to the whole rock 'n' roll vibe.

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Millie Bobby Brown - On the Emmys' red carpet, Millie wore a classic princess-style dress with a tulle skirt and beautiful shoes.

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Millie Bobby Brown - Opting for a more mature look for the Season 2 premiere, she wore a leather long-sleeved dress.

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Millie Bobby Brown - Things take a more serious turn in this all-black ensemble.

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Millie Bobby Brown - How someone who was born in 2004 can look like this in a gown is almost concerning. 

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Millie Bobby Brown - She added an element of playfulness with her converse on the red carpet. 

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Millie Bobby Brown - This pretty look is topped off with some creative hair hoops. 

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Millie Bobby Brown - Nothing is more beautiful on the red carpet than friendship. Aw. 

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Finn Wolfhard - Finn plays Mike on the show. The Canadian actor prefers a classy yet casual style.

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Finn Wolfhard - For casual events, he opts for a good pair of jeans, shirt, and sneakers.

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Finn Wolfhard - At the Emmys, he rocked the red carpet in this black suit with a bow tie.

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Finn Wolfhard - Finn likes to keep it classy at all times, seen here wearing a nice shirt and pants, and a black sweater to complete his casual look.

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Finn Wolfhard - Starting to look more like a lead singer in an indie band...

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Finn Wolfhard - The actor was giving stylish Beetlejuice vibes in these striped pants. 

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Finn Wolfhard - Playful with prints while finding his right light. 

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Finn Wolfhard - Long gone is the young boy you saw in the beginning of the show!

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Noah Schnapp - Noah plays Will on the show, and he is, undoubtedly, one of the most revered cast members when it comes to style.

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Noah Schnapp - The young talent loves the detailed blazers. Here, Noah is seen wearing a white shirt with black buttons and a classy floral blazer.

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Noah Schnapp - For the 2017 Emmys, Noah went for a naval outfit that included a blue-satin suit jacket with gold details and black pants and shoes.

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Noah Schnapp - Even when he is going for a sporty-casual look, he rocks the jeans and blazer combo.

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Noah Schnapp - It may be something casual, but Noah still loves his blazers and cool shoes.

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Noah Schnapp - And then he pulled this fur-lined coat out of the closet and amazed everyone!

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Noah Schnapp - It's rare to find him wearing anything "normal."

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Noah Schnapp - You could say he prefers wearing stranger things.

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Gaten Matarazzo - Gaten plays the cute Dustin on the show. In the group, he's the one most likely to go for the more casual outfits.

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Gaten Matarazzo - However, he knows how to show up to a red carpet event! At the Emmys, he wore a blue suit with lilac details to match the tie.

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Gaten Matarazzo - Sneakers and jeans are his thing, which he matches with different shirts.

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Gaten Matarazzo - Matarazzo is known for wearing cool shirts, usually referencing movies, TV shows or cartoons.

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Gaten Matarazzo - It isn't hard to find him wearing a leather jacket.

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Gaten Matarazzo - He looks completely centered in this mishmash of prints. 

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Gaten Matarazzo - This look certainly marked a creative peak, pairing a neon jacket with satiny pants and a collarless shirt.

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Caleb McLaughlin - This stylish actor plays Lucas on the show. He prefers a more modern and fresh style. 

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Caleb McLaughlin - He loves a bold blazer, like this faded suit.

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Caleb McLaughlin - At the Emmys, he rocked this tailored purple blazer with black pants and shoes.

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Caleb McLaughlin - At casual events, Caleb can be found wearing a nice pair of jeans with a basic t-shirt and some pretty cool shoes.

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Caleb McLaughlin - He is certainly not afraid of bright colors. 

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Caleb McLaughlin - Still, he looks sleek and mature in this darker ensemble. 

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Caleb McLaughlin - There seems to be no look he can't pull off.

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Caleb McLaughlin - A color-blocked jacket, a chain necklace, striped pants with a bit of shine, and bright white highlights: this look is genius!

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Sadie Sink - Sadie plays Max on the show's second season. The teen prefers somber or romantic looks.

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Sadie Sink - For the season two premiere, she opted for a black and white detailed dress and high-heel sandals.

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Sadie Sink - For a social event, she chose a long-sleeved lacy dress.

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Sadie Sink - In this romantic style, she wears a white floral dress with pink heels.

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Sadie Sink - She can also get casual however! Look how well she rocks this casual jeans and t-shirt combo with a sequined blazer!

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Sadie Sink - You'll see her affinity for pink only blossom further. 

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Sadie Sink - She took on the trends of the moment in this combination of bicycle shorts and a blazer. 

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Sadie Sink -

The young star certainly has more stylish looks ahead. 

See also: The best red carpet looks of 2019, so far

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