Chrissy Teigen shows off her and John Legend's newborn son's impressive head of hair

• Chrissy Teigen surprised her followers by announcing she has welcomed a new baby boy via surrogate.
• In an emotional Instagram post, she opened up about her and husband John Legend's surrogacy journey.

Chrissy Teigen and John Legend announced the arrival of their fourth child together, a baby boy on Wednesday evening.

The new arrival, named Wren Alexander Stephens, was born via surrogate on June 19, Teigen shared in a lengthy, emotional Instagram post in which she filled her followers in on all the details of their surrogacy journey.

However, in her first post revealing Wren to the world that followed, Teigen returned to her usual silly self as she poked fun at her newborn's impressive head of hair.

Alongside an Instagram video of Wren being burped while swaddled in a blanket, and sporting thick dark hair, she wrote, "The hair. simple plan is shaking," referring to the Canadian rock band best known for the song "I'm Just a Kid."

The band commented under Teigen's video: "Can confirm…that hair is pop-punk perfection!"

Wren's arrival comes five months after Teigen gave birth to her and Legend's third child, a daughter named Esti Maxine Stephens.

As Teigen explained in her Instagram post announcing Wren's birth, she decided she "wanted to try and carry just one more time" and went through IVF to become pregnant with Esti, who was born in January.

Per her post, the couple — who also share son Miles Theodore, 4, and daughter Luna Simone, 7 — initially reached out to a surrogacy agency in 2021 about the possibility of "having two tandem surrogates, each to bring us a healthy baby boy or girl."

Teigen wrote that "around the same time" that she learned she was pregnant with Esti, the couple met the "most incredible, loving, compassionate surrogate we could ever imagine, Alexandra."

"I knew she was a perfect match for us the moment we spoke to her. All our wishes and dreams aligned," she wrote.

However, their first embryo transfer to their surrogate "didn't survive," and Teigen praised Alexandra for "how hard she fought to get ready for a second transfer."

Teigen said that she and Legend learned that Alexandra had become pregnant with their second embryo transfer as they "crept toward the safe zone of my own pregnancy" in late 2022.

"Just minutes before midnight on June 19th, I got to witness the most beautiful woman, my friend, our surrogate, give birth amidst a bit of chaos, but with strength and pure joy and love."

Legend shared the news of their son's birth on his own Instagram page by sharing a photo of himself surrounded by the couple's four children and another of him and his wife cradling their newborn.

"Wren Alexander Stephens, our new love," he captioned his post.