DIVA ALERT! According to witnesses at New York City's Mercer Kitchen, Kendall Jenner was out  having lunch with BFF Hailey Baldwin when she got upset that the restaurant wouldn't serve her alcohol! SO SHE WALKED OUT!! 


Then when their waitress went after them to collect... Witnesses say Kendall threw money at the waitress?!?! WOW! That's classy! (not)