Millie Katharine Midwinter-Lean was born on 18th August 1995 in Cheltenham, Gloucestershire. She started performing aged 6 with the Everyman Youth Theatre and secured her 1st role shortly afterwards in the 2002 production of The Magician's Nephew.Her mother enrolled her with an agency at 12 in order for her to gain some more confidence. Her first breakthrough came when she was cast as Lucy Turner in Panic Button (2011).After several films Millie decided to leave her acting career behind and in 2013 attended Greenwich University to study Engineering.