Winter, 21, debuted a new red hairstyle earlier this month and fans were quick to say on Wednesday that they hardly recognized her beside her co-stars without her signature brown locks.
“10 years Down. 1 more to go. @abcmodernfam #abcupfronts,” Hyland captioned the photo.
Winter, who stood beside co-star Sofia Vergara, wore a black outfit with her wavy red hair on her shoulder.
Many followers said they didn’t recognize her at first, with one person commenting in part: “I thought it was a new character.”
Someone else agreed: “Same here! At first I had no idea who that was.”
A few followers compared the “Modern Family” star to “Wedding Crashers“ actress Isla Fisher.
“I totally thought Sara was announcing Isla Fisher as their newest guest star,” one person commented.
“Yes! I was like wait new cast member??” another agreed.
Someone else compared Winter to actress and singer Bella Thorne.
Others just commented on how great Winter looked, with one person saying: “She looks beautiful don't you think?”
“Holy sh--. I was like, ‘who's the red head’ and it's @arialwinter_01,” one person wrote in part, adding: “She looks UNBELIEVABLE!!!!!”
Winter first showed off her new look earlier this month, with a post on Instagram.
"Part of yourrrrrr worrrrrld," she captioned the snap — referring to the song from Disney's "The Little Mermaid" — along with two matching emojis.
This isn't the first time Winter has dyed her hair a vibrant hue.
The actress previously opted for a dark red color for the 2018 film "The Last Movie Star" and showed off her look on social media at the time.
Fox News’ Mariah Haas contributed to this report.