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As the years went on, the mum-of-one has become so famous for her likeness to the Little Women star that she's even been invited to dress up as Hermione Granger for conventions.
Keri, from Zionsville, Indiana, said: "My mum says she can really see the resemblance; she sometimes sees a photo of Emma Watson and thinks it's me.
"When I worked at a restaurant, I would constantly get comments from customers who couldn't believe the resemblance.
"It's fun seeing their reaction; I understand why people think I look like her.
"It all started when the first film was released; I went out to the Post Office to post a letter for my mum and a couple of girls called me Hermione. I had never heard of the name so I went home and researched it and realised that I did look like her."
Instructional assistant, Lewis, now makes some extra cash off her likeness, often dressing up as as 30-year-old Emma Watson at events and selling videos on Cameo.
"I started getting really into the films and books and became a big fan of Harry Potter.
"A lot of convention organisers have found my pictures and hired me to play Hermione as a cosplayer; seeing people's reactions at this event are amazing because they are always so shocked."
Kari also shares snaps of herself on Instagram, where she has almost 32,500 followers.
Unlike Hermione, her Insta bio says she's a 'Hufflepuff'.
It's not just the Harry Potter star she dresses as, either. Kari also dresses as Sabrina Spellman and Belle from the 2017 Disney's Beauty and the Beast.
You can check her Insta here.
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