Cerullo, 25, was part of the Brazilian women's team which finished ninth place in the first-ever Olympic rugby sevens event.
After watching the final between Australia and New Zealand, Enya, a manager at the stadium, took to the pitch for a special announcement of her own.
With microphone in hand and heart-shaped balloons on standby, Enya, 28, asked Cerullo to marry her.
"The Olympic Games can look like closure but, for me, it's starting a new life with someone," Enya told the BBC. "I wanted to show people that love wins."
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By the time of Enya's proposal, much of the crowd had already left Deodoro Stadium.
But the emotional scene -- with tears, hugs, kisses and cheering teammates -- was as dramatic as any Olympic final.
In lieu of a ring, Enya tied a gold ribbon around Cerullo's finger.
The couple have been together for two years, reportedly moving to Sao Paulo from North Carolina in the U.S. in a bid to concentrate on Cerullo's Olympic career.
In the final of womens rugby sevens -- a variant of traditional rugby where teams consist of seven players playing seven-minute halves -- Australia beat New Zealand 24-17 to take gold, with Canada securing bronze against Britain.
Though some might say it was love that really conquered all.