The 20-year-old star shared a mirror selfie on Instagram, wearing a white and burgundy dress.

Me and my mini, she wrote in the caption.

@louisvuitton #lvxmurakami.

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YOU ARE INSANELY BEAUTIFUL MILLS, read one compliment while another said, you are so beautiful.

Too wonderful, wow, said another.

Others questioned her appearance and asked, U look 35 what happened??

Young woman in a white dress with puffed sleeves, posing indoors.

MILLIE WHAT HAPPENEDDDD, another questioned.

One wrote, You dont look like a 20 year old girl.

Millies google history: How to look 65 when you are 16, quipped another.

Young person with purple headband, neutral expression, clear skin, and wearing a sleeveless top.

Several speculated whether she went under the knife, asking, Plastic surgery??

What happened with your face Girl, c’mon dont make such a kiss mouth.

This isnt the first time fans have speculated whether theStranger Thingsstar underwent cosmetic procedures.

Young woman in a shimmering, silver dress, standing confidently in a well-lit room.

But not ever will I be defeated.

Ill continue doing what I love and spreading the message to get to make change, she added.

I believe that shouldnt change anything, but its gross and its true, she continued.

Young woman taking a mirror selfie, wearing a patterned dress and holding a designer bag, looks older.

Its a very good representation of whats going on in the world and how young girls are sexualized.

I have been dealing with that but I have also been dealing with that forever.

The young stars latest mirror selfie drew mixed opinions online

Thanks!

A person with dark hair, wearing a purple sweater, sitting indoors and smiling subtly at the camera.

Check out the results:

Young woman in a green top and jeans posing against a purple background, showcasing an older appearance.

Young woman poses with a man holding a camera. She wears white attire and a red bag, while he sports sunglasses and a white T-shirt.

Comment mentioning “you look 35” on a post about Millie Bobby Brown looking older.

Comment questioning appearance with fillers and Botox, related to Millie Bobby Brown looks older.

Instagram comment about age progression, mentioning “so we have gone from 20 to 40.

Instagram comment questioning claims about Millie Bobby Brown’s appearance, mentioning a duck face.

Comment questioning Millie-Bobby-Brown’s new look with 2151 likes.

Comment praising beauty with heart emoji, mentioning “Mills” in response to Millie Bobby Brown looking older.

Comment about Millie Bobby Brown looking older in Hollywood.

Comment joking about Millie Bobby Brown’s appearance, suggesting she looks older than her age.

Comment discussing Millie Bobby Brown’s appearance and addressing rude remarks.

Comment mentioning resemblance to Natalie Portman, related to Millie Bobby Brown new photo.