E! Online reports that the 33-year-old and her partner Scott Disick welcomed Penelope Scotland Disick on Sunday morning at Los Angeles' Cedars-Sinai Medical Centre.

E! quotes Kardashian as saying: "Scott and I are overjoyed to welcome our precious angel... into our lives. We are forever blessed. Mommy and baby are resting comfortably."

29-year-old Disick and Kardashian have a two-year-old son, Mason.

Kardashian had an all-natural birth, with her mother Kris Jenner telling E!: "It was a great. She had an easy delivery.

"[Penelope] is so cute. She looks just like Mason. She's so beautiful. We are so happy."

While Mason's birth was shared with millions of viewers, it is unknown if Penelope will also make her TV debut in the same way as her big brother.

Kardashian is the star of Keeping Up with the Kardashians as well as its spin-offs, Kourtney and Kim Take New York and Kourtney and Khloe Take Miami. She and her younger sisters, Kim and Khloe, have a clothing boutique called DASH.