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Sir Elton John, David Furnish, Oscars Elton John Party 2014

Jamie McCarthy/Getty Images for EJAF

Several celebrities, including Sharon Stone and Glee and American Horror Story creator Ryan Murphy, have followed Elton John's lead and have spoken out against comments made by the founders of Dolce & Gabbana, who had criticized same-sex parenting and what one of them dubbed "synthetic" children conceived via artificial insemination.

John, who shares two sons born to a surrogate with husband David Furnish, took to Instagram on Sunday to slam their remarks. He called for a boycott of their luxury fashion brand.

Designers Domenico Dolce and Stefano Gabbana, who used to be romantic partners, had spoken about the issues to Italian magazine Panorama. Following the backlash, they issued statements (read their responses).

Intrauterine insemination, in which sperm is transferred into a woman's uterus, and in vitro insemination (IVF), in which doctors use eggs and sperm to create fertilized embryos in a lab, are common treatments used by both same-sex and heterosexual couples and are often the only options for opposite-sex pairs struggling with infertility to have children with at least one partner's DNA.

Check out celebrities' full responses to the controversy:

Sharon Stone

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1. Sharon Stone

"We must meet this type of cruelty towards children who are in need and want homes and families with love and open homes," she said in a statement to E! News. "We must meet these type of behaviors with thoughts turned inward towards ourselves. ‘How can I give more to a child in need, how can I do more for the children of this world who need more and deserve more?'"

"To spend time raging against a closed mind is to waste oneself, a self that can be better spent loving where that love is has been removed from," she added. "To dismiss modern medicine as it helps loving people become loving parents is to dismiss all of the miracles of modern medicine."

The actress has three adopted sons.

Ryan Murphy, David Miller

Jason Kempin/Getty Images for Family Equality Council

2. Ryan Murphy

Murphy and husband David Miller are parents to two children, both born via a surrogate mother.

Vanity Fair, Ricky Martin

Vanity Fair

3. Ricky Martin

In 2008, the Latin pop star became a father to twin boys, born via a surrogate mother.

4. Martina Navratilova, Czech-American former tennis star

5. John Barrowman, from Arrow

6. Victoria Beckham, whose sons are Elton's godchildren 

7. Danny Zuker, executive producer of Modern Family

—Reporting by Marc Malkin