Joan Rivers has made a career of insulting famous people, but while some celebs are able to laugh off Rivers' legendary jabs, others are unable to forgive and forget.
Kim Kardashian is apparently in the latter category.
According to Us Weekly, Kim and Joan were seated near one another at the NBC Upfronts on Thursday, but Kardashian had Rivers moved away from her by staff.
Of course, Kim has good reason to be upset, considering it wasn't all that long ago that Rivers called North West ugly.
We think it's safe to say most moms wouldn't want to sit next to anyone who dissed their baby's appearance on national TV.
Naturally, Joan's comment about North was far from the only time she's fired shots at the Kardashian klan.
Back in March, Rivers and Ray J parodied the Kardashian sex tape in a bit that resulted in Khloe Kardashian canceling a scheduled appearance on Joan's E! series, Fashion Police.
So needless to say, this feud has been going on for some time and in a battle of wits, the Kardashians are sadly unarmed. We suggest they stick with the strategy of avoiding Joan at all costs.
Otherwise, they'll just continue to find themselves the punchlines of some downright hilarious jokes: