The campaigner has caused outrage however – seeming to reveal the news days before the official embargo.
Mrs Beckham is a goodwill ambassador for the UN’s anti-AIDS programme.
“Many of us live incredibly lucky, blessed lives and we have a responsibility to help others less fortunate in whichever way we can,” she previously told The Metro, discussing her HIV AIDS campaigning.
“[Defeating the virus] would be a huge contribution to the world for future generations.”
The 42-year-old added: “The main thing I learnt is prevention of mother-to-child transmission of HIV is possible with affordable, readily available medications.”