Brazilian rugby player Isadora Cerullo has been surprised with an on-field wedding proposal following Australia's win in the first women's rugby sevens event in Olympic history at Rio's Deodoro Stadium.

Cerullo's partner of two years, 28-year-old Marjorie Enya, walked onto the pitch as the crowd were dispersing following the final, and popped the question.

Enya, who is a manager at the venue, grabbed a microphone and delivered an emotional speech before embracing her partner to the cheers of onlookers, the BBC reported.

"I know rugby people are amazing and they would embrace it," Enya told reporters.

"She is the love of my life."

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The couple live in Sao Paulo, where Cerullo has been focussing on training for the inaugural Olympic event.

Cerullo, who is a dual US and Brazilian citizen, was reportedly studying medicine in the United States before she was selected for Brazil's Olympic squad.

"As soon as I knew she was in the squad I thought I have to make this special," Enya told the BBC.

Twitter erupted with congratulations from around the world for the newly minted couple, with well-wishers tweeting photos, rainbows and hearts.

Same-sex marriage has been legal in Brazil since 2013.

Hosts Brazil beat Japan 33-5 to finish in ninth place overall in the 12-team women's draw.