Kylie Jenner celebrated her high school graduation and Caitlyn Jenner was noticeably absent from all the photos in the party on Thursday hosted by Ryan Seacrest.

"It must have been an extravagant affair because it seems almost everyone was in attendance, including Kylie's rumored boyfriend Tyga," said E! News. "Khloé Kardashian, Kourtney Kardashian and Kim Kardashian were also on hand to help celebrate their big accomplishment, posing with funny faces for the photo booth Seacrest had for the affair." 

In one of the photos, shared by Kim Kardashian, Kylie Jenner was donning her graduation hat while posing with Kendall Jenner, who graduated from high school in 2014, Kourtney Kardashian, Khloe Kardashian and their oldest sister.

Kanye West's wife wrote, "Graduating class of 2014 & 2015! Congrats @kendalljenner & @kyliejenner for graduating high school!"

But Caitlyn Jenner was nowhere to be found in the celebrations.

"It's unclear whether the 65-year-old former Olympian - formerly known as Bruce - was just shying away from social media during the event or whether she had a clash with her very busy schedule," said Daily Mail.

"However, Caitlyn's absence was no doubt felt by the youngest Jenner girls as she has always been the most passionate about the TV starlets continuing their formal education."

But how did Kylie Jenner and Kendall Jenner graduated from high school when they were seemingly pictured attending runways, events and parties?

E! noted, "Because Kendall and Kylie are always on the go, you might be wondering just how exactly they managed to finish school. Well, a source told E! News that Kylie completed ninth grade at a regular high school but was homeschooled through the end of her years."

In Twitter posts, Kylie Jenner also announced that she graduated from high school as she wrote, "Oh AND.. I finished school last week.. & I know I never post on social media when I'm in class but that doesn't mean... I don't encourage education! Because I do! ️ gooooodnight."