His dad, Des, tweeted: "As some of you worked out, Nanny S passed away. H and Gem came to funeral yesterday which was lovely & private."
He added, "They both gone to LA now. Thanks for all the message. Mum was 86 and poorly a long time so it was coming but still sad when it does. She is at peace now though."
As a result, #RIPNannyS became a trending topic after the news was confirmed.
Harry was subsequently mobbed by fans at LAX airport on Friday when he returned from the funeral, sparking outrage among the fandom. #StopMobbingOurBoys and #WeLoveAndRespectYouHarry were trending topics, as fans tweeted about the lack of respect and privacy that Harry was up against.