Kylie Jenner has shared Instagram photos in which she's posing topless with her boyfriend Tyga.

The 19-year-old Keeping Up with the Kardashians star participated in an uber-sexy photo shoot with Tyga in which they're both holding each other and showing some serious skin.

Jenner posted two of the racy photos Saturday, November 19 on social media as a way to celebrate her boyfriend's 27th birthday.

In the first image captioned, "Happy birthday baby," Tyga is sitting on the ground shirtless in light-washed jeans as a platinum-blonde Jenner is straddling him topless with a darker shade of blue jeans on as well as tan backless heels.

Tyga's face is gently-placed on Jenner's chest above her breasts as she rests her chin on his head. Tyga also has his hand placed inside the back of Jenner's jeans, seemingly grabbing her butt. Both individuals appear relaxed and pensive.

In the second black-and-white photo Jenner captioned, "Irreplaceable," the happy couple is in a similar pose yet laughing together while Tyga grips her back. 

Jenner might have borrowed a page from older sister Kim Kardashian's playbook for this photo shoot. As fans recall, Kardashian appeared topless in husband Kanye West's "Bound 2" video as she straddled him on a motorcycle!

Jenner and the rapper began dating quietly when the reality TV star was 17-years-old. They went public with their romance around the time of Jenner's 18th birthday in August of last year and then -- despite a brief split in May -- have seemed inseparable ever since.