She won a Michigan State University championship with her volleyball team at Romeo High School. She was also a 3-time class president in high school.

Her video "20 Life Hacks EVERY Girl Should Know!" was viewed more than 1.3 million times.

She has a brother and two sisters, one of whom is Biz Betzing. Her cousin Landen has appeared in her YouTube videos. She is married to MMA fighter Josh Brueckner. They run a joint YouTube channel together called Jatie Vlogs. She has a pet golden doodle named Topper who has his own Instagram account under the username topperbrueckner. In February 2023, Katie and Josh announced that they were expecting their first child together. On September 5, 2023, they welcomed a daughter named Skye. In February 2025, they announced they were pregnant with baby number two on TikTok.