EXCLUSIVE PHOTOS - Kendall Jenner Upset After Twitter Feud With Frances Bean Cobain

A makeup-free Kendall Jenner went to the gym on Thursday morning, and the 17-year-old reality starlet was visibly upset after being slammed on Twitter last night by grunge rock princess Francis Bean Cobain.

Kendall tweeted, "just wish things could be easier sometimes mann" on Wednesday evening, and Kurt Cobain and Courtney Love's daughter ripped into her for being a "f*cking idiot" and also slammed her for being "self-involved." Francis added, "oh shh. There are kids on earth abandoned&homeless who forcibly drink contaminated water because clean water isn't accessible ... not to mention, CANCER, famine, poverty, draught, disease, natural disasters, Death..."

Kendall has since deleted the tweet, but she has yet to address the virtual showdown on Twitter or her blog. Maybe it will be covered on an upcoming episode of Keeping Up With The Kardashians?