Stranger Things star Millie Bobby Brown has teamed up with UNICEF Goodwill Ambassadors Orlando Bloom, Liam Neeson, Lilly Singh and Dua Lipa to co-star in a new campaign video for the charity, encouraging people to wear the colour blue in aid of children’s rights as part of World Children’s Day.

Brown, who's changed her name to 'Millie Bobby Blue’ for the campaign, was also named UNICEF's youngest ever Goodwill Ambassador this week, and commented 'World Children's Day is a fun day with a serious message. It is a day where all children are encouraged to speak out about what matters to them... By going blue for UNICEF on this day, we are demanding the world provide a brighter future for kids'.