The couple will arrive at the annual Royal Film Performance at the Odeon Leicester Square in London on December 5.
The Royal Film Performance is an annual charity event held by the Cinema and Television Benevolent Fund (CTBF). It has run since 1946, when King George VI attended the premiere of A Matter of Life and Death.
Idris Elba stars as Nelson Mandela in the biopic, and will attend alongside co-star Naomie Harris, director Justin Chadwick and Mandela's daughter Zindzi.
Mandela: Long Walk To Freedom premiered in South Africa on November 3. It tells the true story of the anti-Apartheid leader's journey from childhood to becoming president of South Africa.
The project will open for a limited run in the US on November 29 and arrive in the UK on January 3. Watch a trailer below: