Rob Kardashian has Karrueche on the Brain ... and on the iPhone (PHOTO)

Rob Kardashian may not only be re-emerging, he might be trying to hook up with the likes of Karrueche Tran.

Rob just posted a pic of his iPhone screen that shows a conversation he was having with Chris Brown's ex, which included a sexy pic of herself. He captioned it, "I like when she send me pictures."

As for the contact info on his phone, he lists her as "Karrooooooooochieeeeee."

Remember, Brown has a penchant for threatening anyone who appears to get close to his ex, including Tyson Beckford.

Rob is trying to downplay chatter that he and Karrueche are banging by saying, "Yall dumb af. I been Friends with Karoooooch since high school. F*** outta here with your negative s***."