She's not a happy camper!

On Monday, Kris Jenner blew off some steam with a bit of shopping at Waterworks in Beverly Hills after her son Rob publicly slammed media darling Kim Kardashian on Sunday.

Mama Jenner may have just gotten back from a relaxing vacation to Cancun with Melanie Griffith and Dakota Johnson -- but it looks like as soon as she got off the plane, her son started causing some major family drama on Instagram.

Over the weekend, the 28-year-old recluse posted a shocking still of a bloody Rosamund Pike from the movie Gone Girl with the caption: "This is my sister Kim, the b*tch from Gone Girl." Ouch!

An insider tells sources that Kris is very hurt that Rob would attack his sister like this so publicly. We have to say -- Kim Kardashian may have her flaws, but comparing her to a vindictive, homicidal murderer -- seems a bit much! Does Kimmy K take too many selfies? She does. But did she slash a man's throat mid-coitus? We hope not!