Kim Kardashian's brother taunted her about her sex tape during a row.
Rob, 25, lashed out at big sister Kim after she tried to advise him on his public split from singer Rita Ora, in scenes shown on her reality show Kourtney And Kim Take Miami, The Sun reported.
Rob apparently told Kim: "I hope your sex tape haunts you for the rest of your life."
The reality star and socialite entered the spotlight in 2006 when a home video she had made with singer Ray J was leaked on the internet, and then bought by a porn distributor.
During the argument Rob also sent Kim a text saying he would "publicly bash you and Kanye" (West, Kim's boyfriend).
The row was sparked after Rob appeared to accuse Rita of cheating on him on Twitter, and Kim advised him, "Don't post anything else, everyone has problems."
Rob later called Kim to apologise and said he was struggling to get over his heartbreak.