The reality star rocked a very risque dress for the family affair.
It looks like Kylie Jenner and Tyga are stilling going strong.
The 19-year-old reality star shared yet another risqué pic to Instagram on Sunday, and this time with her 26-year-old rapper beau.
Posing in nothing but a skin-tight white leotard, Kylie stood in front of the "Rack City" rapper as he cozied up behind her and placed one hand around her hip, just above her upper thigh.
NEWS: Kylie Jenner Hangs Out With Tyga and Blac Chyna’s Son King Cairo Ahead of His Birthday
Jenner later threw a checkered windbreaker over the provocative white one-piece as she helped Tyga throw a Ferrari-themed party for his son King Cairo's 4th birthday.
Jenner took to snapchat to share some photos of the fancy festivities, including a few of her cuddling up to her man.
WATCH: Kylie Jenner and Tyga Enjoy 'Halloween Horror' Date Night
Caitlyn and Kendall Jenner also turned out to partake in the fun and pose together for some sweet family photos.
Kylie even shared an adorable photo of her cousin, North West, slipping face-down on one of the party's inflatable slides (and absolutely loving it).
King is the son of both Tyga and Rob Kardashian’s fiancée, Blac Chyna, and this was actually his second Ferrari-themed party of the weekend. On Saturday, his mom threw him a very similar party, albeit hers also included Legos. Kris, Caitlyn and a number of other family members attended both of King's Ferrari parties.
WATCH: Blac Chyna Celebrates King's 4th Birthday With Epic Lego and Ferrari-Themed Party
On Saturday, Jenner took to Instagram to celebrate the 9th anniversary of Keeping Up With the Kardashians, sharing a special montage of clips and photos from the show's first episode.
Check out the video below for a look at Kim Kardashian's first scene from the long-running reality show, which debuted Oct. 14, 2007.
