Stefano Gabbana, of Dolce & Gabbana, passed remark on Maria Grazia's Dior Couture show at Paris Style Week.
The 54-year-old designer commented on Italian journalist Anna Dello Russo's clip from the show on Instagram, posting: 'Ha sbagliato tutto come al solito.'
Which, when translated into English, approximately means: 'She has gotten it all wrong as usual.'
The remark is presumed to be aimed at Dior designer, Maria Grazia Chiuri, and was first spotted by a fashion blogger with the Twitter handle '@redsequins' who posted the translation on Twitter.
Meanwhile, swathes of A-list stars appeared to enjoy the Dior show included Kirsten Dunst, Jennifer Lawrence, Robert Pattinson and Natalie Portman.
Gabbana has previously commented on Miley Cyrus' Instagram regarding his 'politics'.
When the singer called him out out on it on Instagram last month, Gabbana posted: 'For your stupid comment never more work with him [Miley's model brother Braison Cyrus].
'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.'