On Monday afternoon Kourtney and Kim Kardashian went shopping with their daughters Penelope and Nori, and apparently all the attention put Kourt in a really rotten mood, because she dropped a couple of angry F-bombs on photographers ... while holding her 18-month-old daughter!

When our photographer asked how her lunch with Kim was, she replied, "Don't talk to me ever when I'm with my kids," and when asked what she thought about the media frenzy she yelled, "Shut the f*ck up!" Yikes! Looks like she's taking lessons from Kanye!

But seeing as she's allowed her kids to be featured on multiple seasons of the family's reality show, isn't that a little bit much to demand? If she was Julia Roberts it would be one thing, but keep in mind that Kourtney's claim to fame is being related to Kim, whose claim to fame was starring in a sex tape with Ray J ... just sayin'!