Boating And Underage Boozing? Kendall, 18, and Kylie Jenner, 16, Caught Sipping From Champagne And Wine Glasses At Big Sister Khloe Kardashian’s Yacht Birthday Bash SEE The Tell-Tale Photos!

Jun. 29 2014, Published 12:32 p.m. ET
Growing up too fast? Fans have long criticized KrisJenner for allowing her daughters Kendall and Kylie to act so adult, but now it seems the momager has gone too far. With mom nearby, the teen reality starlets were spotted drinking out of champagne and wine glasses during sister Khloe Kardashian’s 30th birthday party on a yacht Friday night off the shores of New York City.
Kendall Jenner and Kylie Jenner

Too young to toast! Kendall was caught with a champagne glass in hand during the festivities.
Kendall Jenner and Kylie Jenner

The 18-year-old took a big sip from the glass as her much-older sisters and friends partied on.
Kendall Jenner and Kylie Jenner

The 18-year-old took a big sip from the glass as her much-older sisters and friends partied on.
Kendall Jenner and Kylie Jenner

The 16-year-old didn’t seem to care who spotted her.
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Kendall Jenner and Kylie Jenner

Model Kendall chatted with older male guests, including Khloe’s boyfriend French Montana, 29.
Kendall Jenner and Kylie Jenner

She sported a white crop top for the occasion.
Kendall Jenner and Kylie Jenner

The teen sisters chatted on board the Utopia 2.
Kendall Jenner and Kylie Jenner

The teen sisters chatted on board the Utopia 2.