Rihanna has an honorary title of Ambassador for Culture and Youth in Barbados. On February 22, 2008, former Barbados Prime Minister, David Thompson, launched the national "Rihanna Day" in their country. Although it is not a bank holiday, Barbadians celebrate it every year in honour of Rihanna. In February 2017, Rihanna was named Harvard University's "Humanitarian of the Year" by the Harvard Foundation. During Rihanna's third annual "Diamond Ball", former U.S. president Barack Obama, praised Rihanna's work and stated: "[She's] become a powerful force in the fight to give people dignity." On 21 September 2018, Rihanna was appointed by the government of Barbados to be an Ambassador Extraordinary and Plenipotentiary, with special duties of promoting "education, tourism and investment for the island." As of 2019, Rihanna is the world's wealthiest female musician with an estimated net worth of $600 million. She was also listed among "Forbes" Top 100 Most Powerful Women of 2019. In 2020, she debuted on the "Sunday Times Rich List", claiming third place on the list of Britain's richest musicians.