Rob Kardashian, lone wolf of the reality TV clan, was so caught off-guard when sister Kim Kardashian sent photos of Caitlyn Jenner's Vanity Fair shoot to their family group text, that he didn't even realize he was looking at his stepdad.

Kim spilled all at the CDFA Fashion Awards yesterday: "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?'"

Aww, what a great example of a shining young man. In any case, Kim quickly filled Rob in: "I was like, 'Rob, that's Bruce! that's Caitlyn!'"

At which point, Rob came to his senses. "He was like, 'Oh my god, she's beautiful!'" said Kim. "And then he called her and they had a lovefest and it was so cute. But the moment was so funny." 

Adorbs. But for real, what's up with Rob these days? Where's that fool been?