The singer will look at how racism affects people today and her own experiences of it as well as colourism.
Leigh-Anne spoke about the issue briefly back in June when widespread Black Lives Matter marches were taking place after the death of George Floyd.
‘Conversations surrounding racism and colourism are something I constantly have with my boyfriend and family,’ Leigh-Anne said of the documentary.
‘As I have a platform, I want to use that platform to bring this conversation to a wider audience and stand up for my black and brown community.
‘Systemic racism is complex.’
‘Through making this documentary I want to learn how I can best lend my voice to the debate so that the young people who look up to me won’t have to face what me and my generation have had to,’ she added.
The BBC documentary will focus on the experiences that have led the 28-year-old singer to declare that ‘we live in a profoundly racist society’.
The crew will follow Leigh-Anne as she continues her work with Little Mix as well as at home with her family and loved ones.
Speaking of the documentary, BBC Three controller Fiona Campbell said: ‘This is a film we commissioned a few months ago and the start of filming with Leigh-Anne has coincided with the tragic death of George Floyd and the current protests and debates which have brought these issues into sharper focus for her, for Britain and the world.
‘By working with high profile talent like Leigh-Anne, and other important individuals she will meet through this process, we hope the honest conversations this film will feature will have the power to change attitudes, offer insight and help to prevent racism in our society.’
Leigh-Anne’s upcoming documentary follows that of bandmate Jesy Nelson who won awards for her work on a film about cyber-bullying.
The documentary was widely praised for being an honest and unfiltered look at the star’s experience.