Just last week Kim Kardashian wished her brother Rob a happy birthday by sharing a sweet throwback picture with her 28 million Instagram followers.
However relations between the pair seem to have gone drastically downhill since then, if Rob's own Instagram profile is anything to go by.
The 28-year-old former reality star has deleted all images from his feed, leaving only one – a gory still from the 2014 film Gone Girl with a seriously bizarre caption.
The image, which features a bloody Rosamund Pike in her role as deranged killer and sociopath Amy Dunne, is captioned, "This is my sister kim , the bitch from Gone Girl"
Kim's own post in Rob's honour just last week showed no sign of an upset, as Kim told Rob, "I I love you so much and can't wait to share so many more memories with you! Kiki <3 Riki!!!!"
Speculation about a possible feud began last summer when Rob left Italy before Kim's wedding to Kanye West.
After breaking up from singer Rita Ora in 2012, Rob had a bad year, losing money on investments and gaining over 40 lbs. Speaking on an episode of Kourtney and Kim Take Miami in early 2014, the 28-year-old said, "It’s crazy how this whole year, my whole relationship was only negative, all I did was gain f**king 40 pounds and lose so much money."
We hope things work out for Rob and that he and Kim can work through their differences.