The 18-year-old actress defended the 35-year-old reality star Wednesday on Instagram after actress Chloe Grace Moretz criticized Kardashian's nude selfie in the June issue of Glamour magazine.
"Many have asked about my opinion on a certain interview.... all I'm going to say is this: If you take a photo in which you feel confident about yourself and think it spreads a positive image, then go for it," Winter wrote.
"The 'background' doesn't matter - what matters is the message you are putting out there is true to what you believe in - not what anyone else says about you," she argued. "No need to put one another down."
"No picture is the exception to someone else's rule. Even if some people 'know who they are,'" the Modern Family star added without naming Moretz. "Live life on your own terms."
Moretz clashed with Kardashian in March after criticizing the reality star's selfie on Twitter. The actress discussed the conflict with Glamour, explaining she felt she "had to say something" but didn't intend to slut-shame Kardashian.
"That picture wasn't linked to body confidence. It wasn't a #BodyConfidence or #LoveWhoYouAre," Moretz said. "It was done in a slightly voyeuristic light, which I felt was a little inappropriate for young women to see."
"I would hate for young women to feel they need to post certain photos in order to gain likes, retweets, favorites and male attention," she elaborated. "I wasn't slut-shaming. It's not about body shaming ... I pride myself on having opinions."
Winter previously defended Kardashian on the Kyle and Jackie O Show, saying she thought Kardashian's post promoted "body positivity." The actress plays Alex Dunphy on ABC sitcom Modern Family, which airs Wednesdays at 9 p.m. ET.