Julianna Grace LeBlanc known professionally as both Annie LeBlanc and Jules LeBlanc is an American YouTuber, actress, singer, and former gymnast. In December 2018, Business Insider called her one of the "most famous teens in the world." She appeared on the YouTube channel Bratayley from the age of six and has since gained an extensive online following of her own.

LeBlanc was on the YouTube Red series We Are Savvy before going on to work with the Brat network, starring as Rhyme McAdams in Chicken Girls and its spinoff films and the titular character of A Girl Named Jo. On television, she played Lex in the Nickelodeon buddy comedy series Side Hustle.

She has two siblings: a younger sister Hayley, who is also an actress, and an older brother Caleb, who died in 2015 from a heart condition called hypertrophic cardiomyopathy, at the age of 13. LeBlanc started taking gymnastics classes when she was two years old, and her family started posting videos of her online when she was three. She trained as a gymnast until August 2017. The LeBlancs previously lived in Severna Park, Maryland, but moved to Los Angeles, California to better pursue an acting and music career.

LeBlanc was originally known for her gymnastic videos. Her gymnastic meets and tutorials started being published in 2008 on her YouTube channel, formerly known as Acroanna, when she was 3 years old.The channel's name was changed in 2017, and now features music videos of Jules LeBlanc.