Madonna and Cyndi Lauper were among the stars who spoke out to hail the latest breakthrough in gay marriage in America.
The Supreme Court has declared that a key section of the Defence of Marriage Act, which restricts federal benefits for gay couples, is unconstitutional.
Gay rights activist Madonna wrote on her Facebook page: "What a way to start my day!! I'm wearing a smile from ear to ear. There is a G-D! Justice is served. Hallelujah !!"
Fellow singer Cyndi said in a statement: "To all of you who have been waiting on the sidelines for years, for lifetimes, it's a huge day. I am so, so happy for you.
"These decisions not only impact the lives of gay couples, but of gay and transgender youth who struggle to find acceptance from their family and friends. Every step closer we get to equality ensures that these kids have the futures that they deserve and are entitled to."
Openly gay celebrities also joined in the celebrations.
Glee's Ryan Murphy said: "Today is a historic day made all the more meaningful by the fact that my marriage to my husband, David, will now not only be recognised by my home state of California, but federally as well, as it always should have been. Many have suggested that Hollywood, and particularly television, has helped move the country forward on the issue of marriage equality. If that is true, and my work played even a small part in that, I am humbled and reminded of the power of entertainment to enlighten as well as entertain."
Ellen DeGeneres tweeted: "It's a supremely wonderful day for equality. Congratulations everyone. And I mean everyone."
Precious director Lee Daniels joked: "It's a sad day for the gay men who are trying to save their money. But in all seriousness, this day is as important as the day African-Americans were given the right to vote. I'm proud to be an American."
And Rock of Ages director Adam Shankman said: "I never thought in my lifetime I would see anything like this happen. I had settled into subconsciously believing that I would always be viewed as separate and unequal. I have never felt so grateful, and so happy. I look forward to the rest of my married life with my fiance, and soon to be husband, Frank Meli."