The 28-year-old sock designer was torn between his lover and the "Keeping Up With the Kardashians" star - who is currently dating the model's ex-fiance Tyga, with whom she has three-year-old son King Cairo - but is thrilled they have now decided to bury the hatchet and become friends.
Taking to his Instagram account, the once-reclusive star uploaded a photograph of the former arch-enemies posing for a photograph together alongside the caption: "So happy my girls finally got to talk and make peace! #MyFamily #AllLove (sic)."
She captioned it, "When we've been best friends the whole time," before swiftly deleting the photo from her account.
Blac quickly followed suit by uploading a string of pictures with the Kylie's Cosmetics businesswoman; one of a face-swap and another mirror shot.
Meanwhile, it's believed Rob's sister Kim Kardashian West was the person who encouraged the pair to call a truce.