Actress Jena Malone is a new mom.

The 31-year-old The Hunger Games star and her boyfriend Ethan DeLorenzo have welcomed their first child - a baby boy named Ode Mountain.

The actress confirmed the news with an artistic black and white photo of herself and DeLorenzo gazing adoringly at the newborn, which she posted on Instagram on Tuesday (31May16).

"The best weekend of our lives!!!" she added in the caption. "What an incredible blessing to be chosen by this amazing, kind, gentle and beautiful soul to be his parents. Humbled and in complete awe that we get to experience the most ancient and transcendent love that exists.

"Thank you Ode Mountain DeLorenzo Malone."

Jena had previously announced the baby news by posting another picture of herself wearing a floaty dress and Wellington boots while cradling a large baby bump on Instagram.

She wrote: "Womb to womb, To beating wing, I climbed out of the eternal, And into the shape of me... Some words I wrote years ago when I was thinking about my own mother. And the woman she was when she had me. And the woman I was reaching to become.

"The shape your desires make out of you. The body you become to hold your dreams. It's with two feet firmly on the ground and a heart swelling in an ocean of love that I'd like to share the new shape I am becoming to hold the greatest dream of them all. #babybump #newparents."

She credited her "beautiful hearted baby daddy" DeLorenzo for taking the photograph.

He posted a similar photograph of Jena in the woods and wrote, "My family. @jenamalone and my child to be."