Singers Ricky Martin and Courtney Love, producer Ryan Murphy, tennis legend Martina Navratilova and others have joined Sir Elton John in his call to boycott Dolce & Gabbana following comments by the fashion-house founders opposing adoptions by gay couples and calling children born through in vitro fertilization "synthetic."

"How dare you refer to my beautiful children as 'synthetic,' " Sir Elton, who turns 68 on March 25, wrote on Instagram Sunday. The Rock and Roll Hall of Famer has two IVF-conceived children with his husband, David Furnish. "And shame on you for wagging your judgemental little fingers at IVF -- a miracle that has allowed legions of loving people, both straight and gay, to fulfil [sic] their dream of having children," he continued. "Your archaic thinking is out of step with the times, just like your fashions. I shall never wear Dolce and Gabbana ever again. #BoycottDolceGabbana."

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Domenico Dolce and Stefano Gabbana, themselves a gay former couple who were together 23 years before their 2005 breakup, say in the new issue of the Italian magazine Panorama, "We oppose gay adoptions. The only family is the traditional one. No chemical offsprings and rented uterus," according to a translation in the British newspaper The Telegraph. "Life has a natural flow; there are things that should not be changed."

Dolce said, "You are born to a mother and a father -- or at least that's how it should be. I call children of chemistry synthetic children. Rented uterus, semen chosen from a catalog."

Added Gabbana, "The family is not a fad. In it there is a supernatural sense of belonging."

Following the call for a boycott, Gabbana told Panorama, according to a translation from the British newspaper The Guardian, "[I]t was not our intention to make a judgment on other people's choices." Dolce told the magazine, "I am Sicilian and I grew in a traditional family. . . . I am very well aware of the fact that there are other types of families and they are as legitimate as the one I've known.," adding that despite his traditional upbringing, that doesn't mean "that I don't understand different ones. I was talking about my personal view, without judging other people's choices and decisions."

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Martin tweeted to the fashion duo, "ur voices R 2powerfull 2B spreading so much h8." Love wrote, "Just round up all my Dolce & Gabbana pieces, I want to burn them. I'm just beyond words and emotions. Boycott senseless bigotry." Producer Murphy ("Glee," "American Horror Story") said, "These designers' horrifying views are never in fashion. Their clothes are as ugly as their hate." And Navratilova tweeted, "My D&G shirts are going in the bin -- don't want ANYONE to wear them."