US reality TV star Kylie Jenner is reportedly pregnant after revealing a baby bump under an oversized black t-shirt on Snapchat.

Jenner, 20, the youngest member of the celebrity Kardashian family with 97 million Instagram followers, posted a Snapchat photo on Friday in which she appeared to be pregnant.

“Kylie Jenner pregnant, expecting first child with Travis Scott”, reported People magazine.

Celebrity news websites Buzzfeed and TMZ also ran with reports quoting sources Jenner was pregnant with her first child.

Jenner, the half-sister of Kim Kardashian, has been dating rapper Travis Scott, 25, since April.

Kylie Jenner Pregnant, Expecting First Child with Travis Scott https://t.co/VPCBAZvl0S

— People (@people) September 22, 2017

Multiple sources confirmed the pregnancy to People, with a source saying the reality star, with her own lucrative cosmetics business, was due in February.

“They started telling friends a few weeks ago,” the source told People. “The family has known for quite some time. She is really excited and so is Travis.”

Another source close to the family told People: “It is an unexpected but completely amazing turn of events that she could not be more excited or thrilled about.”

Celebrity news website TMZ reported they broke the pregnancy story as an exclusive as social media “exploded” over the news.

Kylie Jenner is PREGNANT!! 😲 👶 😲 https://t.co/7FznnRtuLG

— TMZ (@TMZ) September 23, 2017

Kylie Jenner, First Photos Since TMZ Broke Pregnancy Story https://t.co/GzEUJtpxX6

— TMZ (@TMZ) September 23, 2017

Jenner’s representatives could not be reached for comment.