Miley Cyrus has sparked a feud with Dolce & Gabbana designer Stefano Gabbana over a comment on Instagram.

The Wrecking Ball hitmaker took to the social media site to congratulate her younger brother Braison Cyrus for making his runway debut at Dolce & Gabbana's Spring 2018 Milan Fashion Week show on Saturday (17Jun17). However in her message, Cyrus hit out at the designers over their politics.

"It's never been my little brothers dream to be a model as HE is one of the most talented musicians my ears have ever been given the gift of hearing.... BUT it is a Cyrus family trait to try everything once... and to embrace opportunities that encourage you to step out of your comfort zone!," she wrote. "We believe in trying something new everyday!... I am so proud of you always..."

"PS D&G, I STRONGLY disagree with your politics.... but I do support your company's effort to celebrate young artists & give them the platform to shine their light for all to see," she added.

Stefano Gabbana subsequently hit out at Cyrus over her message, reportedly calling the singer "ignorant" and he vowed the fashion house will not team up with her brother in the future.

"For your stupid comment never more work with him (sic)," he added.

Stefano then re-posted Miley's picture of her brother at the show on his own Instagram account, writing, "We are Italian and we don't care about politics and mostly neither about the American one! We make dresses and if you think about doing politics with a post it's simply ignorant. We don't need your posts or comments so next time please ignore us!! #boycottdolcegabbana"

It is unclear what Miley's issue is with the designers, but they came under fire in 2015 for their controversial comments about gay couples adopting, using surrogacy or in vitro fertilization.