Of course, Kylie's mom, Kris Jenner, couldn't resist taking a ride with Kylie, the two posing for pics.
The now legal Keeping Up With the Kardashians star went blonde for her big day, surrounded by her famous family. Her sisters Kendall Jenner, Kim Kardashian, Kourtney Kardashian, and Khloe Kardashian were all in attendance at the big bash, as well as Kanye West and Khloe's reported boyfriend, NBA star James Harden. Caitlyn Jenner was also at the festivities, Kylie captioning this group pic, "MY GIRLS. party night. #18@12."
Fetty Wap provided the party entertainment, performing his big hit, "Trap Queen."
The festivities appeared to be too much for 38-year-old Kanye to handle. Kim posted this picture of the "Only One" rapper all tuckered out by the end of the night.
Though nobody's probably happier about Kylie's big day than Tyga. The "Rack City" rapper Instagrammed a racy pic of his reported girlfriend on Monday, writing, "Happy bday to the dopest girl ever!"
Late last month, Khloe defended Kylie and Tyga's reported relationship, telling Complex, "I think at 16 I was probably f**king someone that was in their 20s, for sure. I wouldn't say I was even dating, probably just sleeping with them. But again Kylie is not a normal 17-year-old."
"Kylie is taking business meetings and bought her first house, or she's going on a private plane with Karl Lagerfeld to take a meeting," she added. "That's not even what people do in their 30s. It's a rare circumstance, so let's treat this as a special case."