Ever since the Caitlyn Jenner Vanity Fair cover came out earlier this week, the world has focused its attention on the "Keeping up with the Kardashians" clan as Jenner turns into an icon for the LGBT community - but, for "Dancing with the Stars" brother Rob Kardashian, Caitlyn was completely unrecognizable!

The Kardashian-Jenner clan has vastly shown its support to Jenner during her transition into officially becoming Caitlyn, and it seems to be something that has drawn them closer over the past few months, as they're ever surrounded by controversy regarding petty gossip, though now finally uniting over a larger family event - and that includes Rob Kardashian's Caitlyn response.

In the past few months, Rob himself has become the subject of controversy, as he's supposedly in the middle of a depression that his family, including mother Kris and sisters Khloe, Kourtney and Kim, have exploited for the family's reality show, and it's been reported he's planning to sue them - and, nonetheless, Rob Kardashian's Caitlyn response was nothing short of sweet.

According to Yahoo! Celebrity, the first Rob Kardashian Caitlyn reaction was completely oblivious: sister Kim sent the entire family a picture of the Vanity Fair shoot and, while all sisters were aware that was going on, the "Dancing with the Stars" 28 year-old didn't know anything about it.

"'Kim, why are you sending me this? Who is this woman? And why do I care?'" was the first Rob Kardashian Caitlyn reaction upon seeing the photo, according to Radar Online.

Kim spoke about the incident last Monday during the CDFA Fashion Awards, when she was asked how things were going in the family now that Caitlyn had finally come out publicly, saying that, when Rob found out who he was, he just said "oh my God, she's beautiful!" and called her right away, having a sweet moment afterwards.

As Vibe reports, at the time Rob Kardashian's Caitlyn Jenner reaction came out, he was probably the only person in the world who didn't know who she was!