People take part in the Gay Pride Parade in New York June 30, 2013. [Photo/Agencies]

Carl Siciliano, who heads the Ali Forney drop-in center for homeless gay youth in Harlem, said he's happy about the court decision. But he said the humanitarian fight is not over.

"Now that our adults have won this wonderful victory, it is time for us to begin to build a safety net for the more than 200,000 homeless LGBT youth who are stranded on America's streets without shelter," said Siciliano.

Windsor said she long enjoyed the parade with her late wife, Thea Spyer, whom she married in Canada as Spyer was dying in 2007.

In 2009, she suffered a heart attack a month after Spyer's death. While recovering, Windsor faced a hefty bill for inheritance taxes — more than $363,000, because Spyer was, legally, just a friend.

On Sunday, Windsor was one of three grand marshals, joining musician and activist Harry Belafonte and Earl Fowlkes, head of the Center for Black Equity.

"I have marched in the parade for the last several years carrying a huge rainbow flag," she said. "Last year, I was so elated that I danced my way down the whole street, for the entire route of the parade."