Della Brett was born in the small fishing town of Grimsby, England To her mother Patricia Brett and her father Andrew Brett. She has one sister, Danielle Brett - A dancer. She started out Dancing at a local school at age 3, when she reached 16 her mother sent her to an acting group to help bring out her confidence, she quickly realized she wanted to pursue it as a career.
She did course with The National Youth Film Academy in 2012. And was accepted into The New York Film Academy and also on a short course at Guildhall School, but had to turn both down due to financial issues.
She was nominated for best actress for her role in Grimsby: RV (Action Film Challenge)