The Keeping Up With The Kardashians star announced the news with a 90-second Instagram video, featuring the moment she discovered she was pregnant.

Kylie Jenner | IMG Source: AP

Kylie Jenner has confirmed she is expecting her second child with rapper Travis Scott following weeks of speculation.

The reality TV star and make-up mogul announced the news with a 90-second Instagram video featuring the moment she discovered she was pregnant.

The video opens with the 24-year-old carrying a positive pregnancy test around her California home before showing it to Scott, 30.

The Houston-born rapper is then seen hugging her belly and in the next scene Jenner and Scott's three-year-old daughter Stormi accompanies them for an early ultrasound.

The footage also captures the moment she told her mother, Kris Jenner, 65, although no other members of the Jenner-Kardashian family are seen.

"Are you pregnant?" the family matriarch asks. "Stormi, we're gonna have a baby! This is one of the happiest days of my life."

The video ends with Stormi kissing her mother's growing bump.