Phoebe Tomlinson has given birth to her first child (Image: Instagram)

Phoebe Tomlinson, the younger sister of One Direction star Louis Tomlinson, has given birth to her first child.

The 19-year-old influencer announced in June last year that she was pregnant and about to become a mother with her 26-year-old boyfriend Jack Varley.

Phoebe later said she was having a boy, but soon discovered that her child was actually a girl.

Phoebe and footballer Jack announced their daughter’s arrival on Friday (January 5), giving their millions of followers an intimate look at the birth.

Phoebe uploaded a black and white video of her birth on social media while the song “I Get to Love You” played in the background.

In her caption, she revealed that her baby girl’s name is Olive Johannah Varley and that she was born on January 4 and weighed 3.5kg.

Phoebe called it “the best day of our lives”.

Olive’s middle name is a powerful tribute to Phoebe’s late mother Johanna Deakin, who died of cancer in 2016.

The video shared by the fashion and beauty fanatic showed her in the birth pool as Jack held her hands and offered words of encouragement.

She was then seen holding her newborn baby with an exhausted look on her face as the new father gave her a sweet kiss.

New mother Phoebe wiped away tears as she hugged her daughter.

She was showered with congratulations in the comments, with dad Mark Tomlinson writing: “Way more than proud ❤️ this is how the best life journey ever begins ??????????????????”

Older sister Lottie, mother of son Lucky with Lewis Burton, reposted the clip on her Instagram Story and wrote: “So incredibly proud of you.”

“Olive, Auntie will love you forever.”