The 'Keeping Up with the Kardashians' stars reportedly stopped speaking after the 27-year-old sock designer skipped his sister's wedding to Kanye West in Florence, Italy in May, amid rumours they had an argument about his recent weight gain shortly beforehand.
But Rob hinted they have now mended their relationship by reaching out to the brunette beauty, 33, on Twitter on Thursday (07.08.14) to gush about Kim's 13-month-old daughter, North.
Along with two adorable pictures of the tot in the airport, he tweeted: ''Goodness @KimKardashian she's soooooo pretty!!!! LOVE HERR (sic)''
Kim responded: ''@robkardashian she loves her uncle Robby (sic)!''
The friendly exchange comes just weeks after Kim lashed out at Rob's ex-girlfriend Adrienne Bailon after she claimed in an interview that dating him from 2007 to 2009 had hurt her career.
A furious Kim tweeted: ''Funny how she says being with a Kardashian hurt her career yet the only reason she has this article is bc she is talking about a Kardashian
''So sad when people try to kick my brother when he is down #FamilyForever (sic)''
Kim recently admitted on her family's reality series that she was tired of Rob complaining about his weight and wanted to teach him ''tough love.''
She said: ''I think I'm just more of the tough love kind of person. My personality is like, 'All right, you complain, you don't like it, get up and do something about it.' ''