Alli Michelle Simpson was born in Gold Coast, Queensland to parents, Angie and Brad Simpson, on 24th April, 1998. She moved with her family to Los Angeles for her older brother, Cody Simpson 's career, who is now a famous Australian singer and has been winning award s since 2010. In her spare time, she likes to post videos of her herself with one of her best friend, actress Madison Pettis , on YouTube. She is currently a Pastry Shoes Brand Ambassador, a shoeline called "Pastry Shoes", which was first started by the Simmons sisters, Angela Simmons and Vanessa Simmons . As of 2012, Alli has landed a small role in her first movie, ever, called 12 Dogs of Christmas: Great Puppy Rescue (2012).

Her best friends are Madison Pettis , Jasmine Penwarn, Sophie Harrison and Ruby Green .Her hobbies include swimming, surfing, shopping, styling, dancing, singing and hanging with friends.She currently lives in Los Angeles, California.She does modeling for Love Pastry.She has two brothers, Cody Simpson and Tom Simpson.Her parents are Angie and Brad Simpson .She is an australian actress and model.