In the 90-second video, the 24-year-old entrepreneur said she is expecting a baby with her boyfriend, rapper Travis Scott. The couple already have a three-year-old daughter, Stormi Webster.

Jenner is the founder of beauty line Kylie Cosmetics.

The video montage opens with a positive pregnancy test and then shows Jenner and her boyfriend taking their daughter to the doctor’s office for the ultrasound.

The rest of the video captures celebrations from Jenner’s 24th birthday party last month, and clips of Stormi kissing her mother’s growing baby bump.

“Are you pregnant?” Kylie’s mother, Kris, asks as she looks at sonogram photos in the video. “This is one of the happiest days of my life.”

Multiple outlets had reported last month that Jenner was pregnant, but yesterday’s Instagram video marks the first public confirmation.

Jenner, the youngest sibling of the Kardashian clan, kept her first pregnancy private until a few days after Stormi’s birth, when she shared a first picture on Instagram.

“Keeping Up with the Kardashians”, the reality series that made the family a household name, marked its final episode in June.

Jenner’s social media presence now counts 265 million Instagram followers.