Kylie Jenner and Tyga
Kylie Jenner posted topless picture with boyfriend Tyga.Facebook/ Kylie Jenner

Kylie Jenner shared a very steamy and racy picture of herself with boyfriend Tyga on Instagram to mark Tyga's 27th birthday.

In the first shot, the pair is seen wearing just a pair of jeans as she straddled the 27-year-old rapper and she captioned it, "Happy birthday baby."

happy birthday baby ?

A photo posted by Kylie (@kyliejenner) on

Kylie missed his birthday last year as they were on a break at that time.

The Keeping Up With The Kardashian star then shared another black and white picture from the same shoot, where the caption reads "Irreplaceable." This snap shows the pair laughing together, with her face turned towards the camera.

Irreplaceable ?

A photo posted by Kylie (@kyliejenner) on

Earlier this week Kylie started the birthday celebrations early – as she hosted a surprise party along with Tyga's four-year-old son King Cairo and she shared a number of videos on Instagram.

On Friday night, Jenner took to social media with her friends to share a series of sexy pictures during some pre-birthday celebrations for Tyga. She was seen wearing a black spaghetti strap dress.

Goodnight ?

A video posted by Kylie (@kyliejenner) on

Jenner eventually began a custom "Happy Birthday Tyga" filter on Snapchat that features a cartoon creation of the happy pair.