Also widely known as Annie LeBlanc, she became famous as one of the three siblings featured on the family vlog YouTube channel Bratayley. She has also starred on the Brat web series Chicken Girls and A Girl Named Jo as well as the Brat film Intern-in-Chief. She signed a talent deal with Nickelodeon in 2018 and began starring in their web series Camp Nick a year later. She was also cast as Lex on the Nickelodeon series Side Hustle.
She first started out on the YouTube channel Acroanna, where she posted gymnastics meets and tutorials. She trained as a gymnast until August of 2017.
She has over 17 million fans on TikTok and more than 9 million followers on Instagram. She was formerly part of the collaborative YouTube channels SevenAwesomeKids and Gymscool. In October 2017, she posted her first original song to YouTube, titled "Ordinary Girl." In the Brat universe she played the character of Rhyme McAdams.
Her full name is Julianna Grace LeBlanc. Her parents' names are Katie and Billy. She collaborates with her sister Hayley on the channels Bratayley and OMMyGoshTV. Her older brother Caleb passed away in 2015. She dated Asher Angel from 2019 to May 2020.
She became good friends with her childhood idol, Olympic gymnast Shawn Johnson.