Caitlyn Jenner broke the internet with her Vanity Fair cover yesterday, and her transformation has been so incredible she even caught one of her stepkids off guard!

Kim Kardashian attended the CDFA Fashion Awards on Monday night, and she was happy to chat about Caitlyn's big debut. But get this -- Kim, who just announced that she's expecting her second child with hubby Kanye West, revealed that her brother Rob had no idea who Caitlyn was!

Kim told Access Hollywood:
    "It was so funny because all the girls, we knew that Caitlyn was shooting this but my brother had no idea. 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?' And I was like, 'Rob, that's Bruce! That's Caitlyn!' And he was like, 'Oh my god, she's beautiful!' And then he called her and they had a lovefest and it was so cute. But the moment was so funny."

Kim already tweeted her congrats to Caitlyn, and she had more words of support for her stepmom. "This is Caitlyn's moment and it's her time to express herself and just be herself, and that's really what life is about," she added to Extra. "She just wants to help people that don't feel comfortable in their own skin, just to be confident in who they are."

Caitlyn's mom Esther told Access Hollywood, "She's beautiful! [Caitlyn] is… so much more at ease." But it doesn't look like she's quite ready to say goodbye to her son. "I still have to call him Bruce," she added. "His father and I named him that. It's going to be a struggle for me to get used to the change, but happily so… I'm very happy for him – or her!"

Caitlyn, who has now amassed over $2 million Twitter followers, had more thoughts on her transition. She told VF contributing editor Buzz Bissinger:
    "It's funny, my mother, my mom, she has not met Caitlyn yet. We’ve talked on the phone, she is coming down... In about a week and a half... I’m sending a plane to go pick her up, and my sister, because she’s 89 years old and cannot get on the airlines, but she has to come down and, you know, we have to do this. For my mom I’ll send a plane. What I told her, 'Isn’t Caitlyn a much better friend?' Bruce, he would never send a plane. No, no, no, what a jerk the guy was, okay, Caitlyn is like, 'Send the plane. Mom, we’re sending a plane, we’re going to go pick you up and bring you down here'... It seems like she has a lot more friends than he ever had."

Caitlyn continued:
    "I’m just going to go live life, I’m going to go enjoy life. I have nothing left to hide. I am kind of a free person, a free soul. [Up] to this point I would wear, you know, Bruce would wear, you know, sweatshirts with hoods on them so paparazzi can’t get pictures and all that kind of crap, and I didn’t want them to see if my fingernails were polished or, you know, on and on and on. It was just hell. To be able to wake up in the morning, be yourself, get dressed, get ready to go out, and just be like a normal person. That’s a wonderful feeling to go through life. I’ve never been able to do that; it’s always been confusion, it’s always been, you know, I’ve got one side [with] boy clothes, the other side’s women’s clothes. It’s like I cleaned the whole closet out -- the boys stuff is gone."

So what do other folks have to say about Caitlyn saying goodbye to Bruce and coming out to the world? Though the showbiz community has been overwhelmingly supportive (fellow trans star Laverne Cox penned a thoughtful note on Tumblr), last night Drake Bell (we actually forget why he's famous) ruffled feathers when he tweeted, "Sorry…still calling you Bruce." After receiving a number of angry responses, the actor then added, "I’m not dissing him! I just don’t want to forget his legacy! He is the greatest athlete of all time! Chill out! Calm down children."

Click thru to read Cox's sweet note .. and to see what Jessica Lange had to say after a number of people pointed out how much she looks like Caitlyn!