Kylie Jenner reportedly had a tantrum when she didn’t get her way at a nightclub, reports. The 16-year-old half-sister of Kim Kardashian is starting to develop a bit of a bad-girl reputation, and the prima donna claims are only fanning the rumors.

According to a source who spoke to the celebrity news site, the youngest “Keeping Up With The Kardashians” star went to a luxe Beverly Hills hotel around 8:30 p.m. last Friday with a group of young friends, including longtime pal Jaden Smith, 15.

The reality scion was in a good mood -- at least until she didn’t get her way. Apparently when the underage Jenner was denied alcohol, her demeanor towards the staff changed drastically. A source said she berated the hotel host and asked, "Do you know who I am?" before she said the place wasn’t worth her time.

"She was a complete nightmare," a hotel source told "She started out really nice. But when she didn't get what she wanted, it was like someone flipped a switch." Jenner reportedly stormed out of the swanky hotel with her friends, but not before she said it was “f--- lame.”

Though reps for Jenner wouldn’t comment, the teen took to Twitter to express her frustration with the story. "I'm not going to sit around and let grown adults create untrue stories about me underage drinking & partying every night with a fake I.D.," she wrote. "And F.Y.I. regarding the 'club nights,' I was with my father & family supporting my brother and sister-in-law.”

Then the “KUWTK” star added to her younger fans: “And to all the young girls out there just like me, carry yourself with class and dignity and don't let ANYONE determine your future.”

Though Jenner might have been supervised when she went to The Troubadour on Oct. 19, the bad-girl reputation for Jenner and sister Kendall began when they were photographed leaving Vignette Lounge, a 21-and-older sex-themed club, looking disoriented-- a time out she didn’t mention on her Twitter rampage.