Kylie Jenner has confirmed that she gave birth to a baby girl last week.

The Keeping Up With The Kardashians star, 20, has been at the centre of pregnancy rumours for months but has managed to keep the news a secret.

She posted a message on social media on Sunday (US time) announcing that she and boyfriend Travis Scott welcomed a “beautiful and healthy” daughter on February 1.

Jenner said she had kept the pregnancy to herself because she wanted to “prepare for this role of a lifetime in the most positive, stress-free and healthy way” that she could.

She said: “I’m sorry for keeping you in the dark through all the assumptions.

“I understand you’re used to me bringing you along on all my journeys.

“My pregnancy was one I chose not to do in front of the world.

“I knew for myself I needed to prepare for this role of a lifetime in the most positive, stress-free and healthy way I knew how. There was no gotcha moment, no big paid reveal I had planned.

“I knew my baby would feel every stress and every emotion so I chose to do it this way for my little life and our happiness.

“Pregnancy has been the most beautiful, empowering and life changing experience I’ve had in my entire life and I’m actually going to miss it,” she continued.

“I appreciate my friends and especially my family for helping me make this special moment as private as we could.

“My beautiful and healthy baby girl arrived February 1st and I just couldn’t wait to share this blessing. I’ve never felt love and happiness like this I could burst. Thank you for understanding.”

Jenner’s sister Kim Kardashian welcomed a baby girl named Chicago in January and her sister Khloe Kardashian is seven months pregnant.