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Rob Kardashian’s First Response To Caitlyn Jenner’s Vanity Fair Cover: 'Who Is This Woman?’

The youngest Kardashian had no idea about Caitlyn's big reveal.

Rob Kardashian got quite a surprise when he first saw Caitlyn Jenner's Vanity Fair cover, asking the question: Who is this woman?

That woman just so happens to be his stepfather, Bruce, who now identifies as a woman after her transition.

Rob's sister, Kim, who just announced that she's expecting her second child, talked to Access Hollywood at the CDFA Fashion Awards on Monday night and revealed that her baby brother was oblivious to Caitlyn's historic, gorgeous and now-iconic cover.

"It was so funny because all the girls, we knew that Caitlyn was shooting this, but my brother had no idea," Kim said. "So I sent it on a mass text to everyone and my brother was on it and he goes, 'Kim, why are you sending me this? Who is this woman? And why do I care?'"

She added laughing, "And I was like, 'Rob, that's Bruce! That's Caitlyn!'"

So what was Rob's response? Well, let's just say he was nothing but overjoyed for Caitlyn.

"And he was like, 'Oh my god, she's beautiful!' Kim said. "And then he called her and they had a love fest and it was so cute. But the moment was so funny."

Caitlyn's VF cover and photo spread were shot by famed fashion photographer Annie Leibovitz and before her moment in the spotlight, Kim was there to give her some pointers on how to look and feel your best.

"I just said, 'Practice by yourself to find out how you feel most comfortable,'" Kim said. "And she figured it out. She looked amazing."