Kendall Jenner is proud of her father. The model and reality television star was the first family member to share her support for Bruce Jenner and his Vanity Fair cover as a transgender named Caitlyn.

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The 19-year-old runway star shared a behind-the-scenes clip of Caitlyn getting ready for her photo shoot with famed photographer Annie Leibowitz in her Malibu home.

In the video, Caitlyn says, "Everyday you always had a secret from morning to night. Caitlyn doesn't have any secrets. As soon as the Vanity Fair comes out, I'm free."

 now that's a cover.

A video posted by Kendall Jenner (@kendalljenner) on Jun 1, 2015 at 9:57am PDT

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Kris Jenner's ex-husband sat down with writer Buzz Bissinger for the emotional interview with the magazine. Caitlyn told the mag, "If I was lying on my deathbed and I had kept this secret and never ever did anything about it, I would be lying there saying, 'You just blew your entire life."

Kendall simply captioned the video with, "Now that's a cover."

Many followers commented on the clip with, "This is still a man who is pretending to be a woman. He can pay for millions of dollars in surgery from plastic surgeons, but that pesky Y chromosome doesn't lie," along with, "I'm in disbelief simply because I never thought I'd see the day. Good for you Caitlyn! I hope you're happier now than you've ever been."

Another fan wrote, "Wow.. No wonder Kim pulled out the pregnancy card. Bruce will get the spotlight for a minute."

A special docuseries following Jenner's transformation as Caitlyn will air on the E! channel this summer. The full Caitlyn interview is available in this month's issue of Vanity Fair on newsstands on Tuesday, June 9th.