She grew up right before our eyes!

Kendall Jenner turned 18-years-old yesterday, and the aspiring model celebrated with a family dinner at Mastro's Steakhouse in Thousand Oaks.

Big sister Khloe Kardashian came without estranged hubby Lamar Odom, but Kim brought fiance Kanye West to join in on the fun. Little sister Kylie attended, as well as recently separated parents Kris and Bruce Jenner.

We didn't spot Kourtney and Scott, so we're guessing they stayed home with kids Mason and Penelope.

The whole gang donned odd masquerade-type masks, and it looked like quite the bash to welcome the teenager into adulthood.

Speaking of adulthood, various media outlets are reporting that the brunette beauty is already receiving lucrative offers to make a sex tape, and even though Kimmy K did it, we doubt Kendall is going to go down that road.

Happy birthday Miss Jenner!