Katelyn Ernst is a 22-year-old American TikTok star and content creator from Florida, born on February 13, 2004. She is known for outfit, fashion, workout, and dance videos on her @katelynernst4 TikTok account, which has about 1.3 million followers and more than 95 million likes. She often films with her identical twin sister, Julia Ernst, who is also a creator. Fans sometimes search for her as “Katelyn Earnst,” but the correct spelling of her surname is Ernst.
Katelyn Ernst was born in Florida and grew up there with her family, including her twin sister, Julia. She made her TikTok debut in October 2021. One of her first modeling videos was a homecoming dress clip she captioned “Cheesy hoco dress video,” and late that year she posted a video of herself indoor skydiving at an iFLY location. In April 2022, one of her TikTok dances went viral with more than 3 million views, and her following grew quickly after that.
Today, she posts outfit-of-the-day videos, clothing hauls, gym and workout clips, “day in the life” vlogs, and twin videos with Julia. She also shares her favorite fashion finds on the LTK shopping app under the name KatelynErnst.
| Attribute | Details |
|---|---|
| Name | Katelyn Ernst (sometimes misspelled Katelyn Earnst) |
| TikTok | @katelynernst4 (about 1.3 million followers) |
| Date of Birth | February 13, 2004 |
| Age (as of October 2026) | 22 years old (turns 23 on February 13, 2027) |
| Zodiac Sign | Aquarius |
| Birthplace | Florida, USA |
| Nationality | American |
| Profession | TikTok Star, Content Creator |
| On TikTok Since | October 2021 |
| Twin Sister | Julia Ernst (@juliaernstt1) |
| Net Worth | Not disclosed |
Katelyn Ernst was born on February 13, 2004, according to Famous Birthdays and TheFamousPeople. That makes her 22 years old as of October 2026, and she will turn 23 on February 13, 2027. Her zodiac sign is Aquarius. Earlier versions of this page said she was 20, which was only true in 2024.
Katelyn has not shared her height, weight, or body measurements, and no reputable source has published them. The height and bra-size figures on earlier versions of this page were unverified, so we have removed them.
Katelyn built her audience on TikTok, where she has posted more than 1,000 videos. As of October 2026, her account has about 1.3 million followers and more than 95 million likes, up from the 1.1 million followers listed on older versions of this page. Her early videos featured trending dances and lip-syncs, and her newer posts focus more on fashion, outfit ideas, hauls, makeup, and workouts.
Her TikTok bio lists an LTK storefront, a discount code with the activewear brand YoungLA, and a business email through the talent agency Insight Media, which shows she works with brands as a professional creator. Like fellow creators Sondra Blust and Rachel Pizzolato, she has turned short-form videos into a full-time career.
Katelyn has an identical twin sister, Julia Ernst, who runs her own TikTok account, @juliaernstt1, with about 1.1 million followers. The sisters often appear in each other’s videos, matching outfits, trading makeup tips, and sharing “twin” trends. Katelyn even keeps a dedicated twin playlist on her TikTok profile.
Katelyn keeps most of her family life private. Besides Julia, her mom sometimes appears in their videos, but she has not publicly named her parents. She has not confirmed a current relationship, and the dating claims on bio sites conflict with each other, so we do not list a boyfriend. Older versions of this page said she was studying at Florida State University, but we could not confirm her college details from a reputable source.
Katelyn Ernst has not disclosed her net worth, and no reputable source has published a verified figure. The “$800k to $850k” estimate on earlier versions of this page was unsourced, so we have removed it. Her income comes from brand partnerships, sponsored posts, affiliate links, and creator programs. For another young TikTok star, read our profile of Tatiana Kaer.
Katelyn Ernst is an American TikTok star and content creator from Florida, known for fashion, outfit, workout, and twin videos on her @katelynernst4 account, which has about 1.3 million followers.
As of October 2026, Katelyn Ernst is 22 years old. She was born on February 13, 2004, in Florida, and her zodiac sign is Aquarius.
The correct spelling is Katelyn Ernst. Katelyn Earnst is a common misspelling, and her TikTok handle is @katelynernst4.
Yes. Katelyn Ernst has an identical twin sister, Julia Ernst, who is also a TikTok creator with about 1.1 million followers on her @juliaernstt1 account.
Katelyn Ernst has not shared her height, and no reputable source has published it. Height figures on bio sites are unverified.
Katelyn Ernst has not disclosed her net worth, and no reputable source has verified a figure. Estimates such as $800k to $850k are unsourced. She earns from brand partnerships, sponsored posts, and affiliate links.
Last updated: October 29, 2026
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