Media mogul Oprah Winfrey has donated $12 million (£7.7 million) to the Smithsonian's National Museum of African American History and Culture in Washington, D.C.
The Color Purple star's gift will help cover the costs of the building, which is currently under construction and due to open in 2015.
As a result of the 59 year old's generosity, bosses will name the the site's 350-seat theatre in her honour.
A statement from the former talk show host reads, "I am so proud of African American history and its contributions to our nation as a whole. I am deeply appreciative of those who paved the path for me and all who follow in their footsteps. By investing in this museum, I want to help ensure that we both honour and preserve our culture and history, so that the stories of who we are will live on for generations to come."
The Oscar nominee, who has been on the museum's advisory council for nearly a decade, previously cut a $1 million (£645,161) cheque to the organisation in 2007.