We hope this isn't true! If so, it sounds like someone needs to smack Kendall Jenner upside the head and teach her some manners!

Apparently Kendall and bestie Hailey Baldwin were dining at Mercer Kitchen in New York City last Monday, and the 18-year-old reality star became unhappy when "the staff wouldn’t serve her [booze] because she’s underage," according to Page Six. "Kendall got up and left and didn’t pay for all the food . . . about $60 worth, and without a tip." When Kendall's waitress, Blaine Morris (who coincidentally played Betty Nardone on MTV’s Skins) ran outside to ask Jenner to pay the bill, the girls started laughing. And thing things got worse...

"Kendall took a couple of $20 bills out of her wallet, threw them at the server and walked away, not even counting if it was enough or if it included a tip," according to an eye witness. After everything went down, Morris tweeted, “That horrible moment you chase a Kardashian down the street because she forgot to pay her bill to be thrown money in your face.”

Kendall’s rep wouldn’t comment on the incident, but a rep for Baldwin said, “They thought everything was paid for. Kendall was polite and asked ‘Does this cover it?’ They didn’t run."