While their remarkable careers stand out, the Olsen twins also boast a collection of strange quirks.

Yes, you read that right.

“Being fraternal means they originated from separate fertilized eggs and do not share identical DNA.

Ashley and Mary-Kate Olsen posing

Nonetheless, there were subtle differences between the sisters even then.

As the Olsen twins have matured, the physical disparities between them have become more apparent.

However, the reason behind this oddity is quite straightforward their baby teeth fell out at different times.

Ashley and Mary-Kate Olsen fraternal twins

Whenever they did showcase their smiles, headlines would emerge.

Ashley added that the thought of gaining millions of followers overnight makes her anxious.

She added, “We’ve stayed quite sheltered.”

young Mary-Kate and Ashley Olsen smiling

The sisters' reluctance to embrace the digital world extends beyond social media the two havenever purchased anything online.

Despite being avid fashion lovers, Mary-Kate and Ashley still prefer the in-store experience.

“I prefer to see, touch, feel, and experience,” Ashley toldVoguejust days prior.

The Olsen twins wearing sunglasses

The twins have also extended this approach to their brands, particularly The Row.

In contrast, Mary-Kate Olsen has her own strange beauty habit involving her hair.

Notorious for leaving her house with wet hair, Mary-Kate explained toTeen Voguethat she intentionally lets her locks air-dry.

The Olsen twins posing together

Mary-Kate and Ashley Olsen are notorious smokers, but the Internet appears oddly fascinated by their bad habit.

There’s an Instagram page dedicated solely to photos of the sisters smoking, cleverly named@mka_smoking.

As per anMTVreport, a visitor said, “I love that they still smoke.”

The Olsen twins walking together