The world was watching, and let out a collective 'awww' when Brazilian rugby player Isadora Cerullo and her girlfriend got engaged in public at the Deodoro Stadium in Rio.

As the crowd dispersed after the Australian women's rugby sevens team won a gold medal against New Zealand on Tuesday, Marjorie Enya, 28, a volunteer stadium worker, walked onto the pitch.

With TV cameras and iPhones recording the moment, Enya asked Cerullo to marry her. Happily, Cerullo, 25, said 'yes' and the pair kissed and hugged while the crowd cheered, and millions watched online.

There were world-wide tributes from near and far via Twitter and other social media.