"We were given this life because you were strong enough to live it! I couldn't be prouder!!! Caitlyn, you are beautiful!!!" Khloe posted on Instagram alongside a photo of Caitlyn's magazine cover.
Move over, Kenny! "now that's a cover," Kendall said on an Instagram of behind-the-scenes footage from her dad's Vanity Fair shoot.
"Caitlyn Jenner for Vanity Fair. Annie Leibovitz! How beautiful! Be happy, be proud, live life YOUR way!" stepdaughter Kim tweeted.
"be free now pretty bird," Kendall tweeted in regards to her dad's new image.
"Tonight we share a part of the journey we have been on in hopes of helping others in similar situations, or simply to help make the world a less judgmental place. We are all God's creatures and we all have a story. Let's work together to be kind. #family," Kourtney posted on Instagram prior to the Keeping up With the Kardashians: About Bruce special.
"At the end of the day, I just want him to be happy," Caitlyn's former wife said in an interview with The New York Times. "He's going to find his happiness, and he's going to have his journey.
"Understandingly, this has been very hard for me. You will hear what I have to say when I'm ready to but this isn't about me. I'm so proud of you, Dad. You are so brave. My beautiful Hero," youngest daughter Kylie shared on Twitter after her father sat down with ABC's Diane Sawyer for an emotional two-hour interview regarding her gender transition.
"You have always been a role model to me and now more than I ever, I look up to you. LOVE YOU," Rob posted on Twitter for following Caitlyn's announcement.
"I don't know what life would be like if you always felt like you weren't yourself. I know it's not something that you or I could really fully understand, but I don't even think we have to. As long as he is happy, and he wants to live his life, however he wants to live it, that just makes me happy. And I support him 100 percent," Kim said of the Olympian's transition in an interview with Matt Lauer on NBC's Today.
"I felt like for so many years, you know, me and you had a big disconnect and if I would have had any idea of some of the things that you were struggling with, I wouldn't have been so insecure about why we couldn't get along properly, sometimes," Scott said in part 2 of the Keeping up With the Kardashians: About Bruce special.
"When you're that close to someone, there are clues you can see," Brandon said of his father during the Diane Sawyer interview. "I feel like I'm getting an upgraded version of my dad, of a parent."
"We want you to do what makes you happy. We all do, and we're going to support you and be there for you, but you have to be honest with us, even if it hurts you, cause it's going to hurt all of us," Khloe explained to Caitlyn on Keeping up With the Kardashians: About Bruce special.
"Proud to call you my family," Brandon's wife posted on Instagram alongside a photo of Caitlyn.
"Couldn't be a more proud daughter. With courage and bravery, let's change the world. I am honored to stand by Bruce's side and support him," Kourtney said on Twitter.
"I think he is ready for the challenge and ready to help other people's lives that might be going through the same things that he's going through. And that's something that he's really proud of and something that he is really ready to take on. I'm really proud of him for that," Kim told Matt Lauer.
"Not only was I able to call him my husband for 25 years and father of my children, I am now able to call him my hero," Kris warmly said of Caitlyn on Twitter.
"You won another gold tonight. I stand with you on this journey. I love you Dad," Caitlyn's youngest son Brody wrote on Instagram.
"That alone makes me so happy. To see him so happy and to see him going through this and staying so strong and really thinking about his kids is amazing," Kendall told Giuliana Rancic at the Billboard Music Awards when asked about her father's decision to take his transition public.
"Just finished watching the #BruceJennerInterview with the family. Bruzer, I'm soooo proud of you! Dads really are heros," Khloe tweeted following Caitlyn's interview with Diane Sawyer.
"I think there is still an adjustment and there is family therapy. We're really close. I see reports that say, this one doesn't support him, and this one's over here, and my mom feels this way, and it's all really so made up. We all really support him. Is it a hard adjustment? Yes," Kim said in an interview with NBC's Matt Lauer.
MORE PHOTOS: Keeping up with Caitlyn Jenner