Peter Sblendorio | New York Daily News

Chrissy Teigen and John Legend welcomed a baby boy via surrogate this month, the couple revealed in a surprise announcement Wednesday.

Wren Alexander Stephens is their fourth child. Teigen gave birth to daughter Esti in January.

“Around this same time, we also met the most incredible, loving, compassionate surrogate we could ever imagine, Alexandra,” Teigen wrote. “I knew she was a perfect match for us the moment we spoke to her.”

Teigen said the first embryo they tried with Alexandra did not survive. Then, during Teigen’s pregnancy with Esti, the surrogate became pregnant with Teigen and Legend’s son.

“We ate hot pot to celebrate, watched ‘Vanderpump Rules’ with our growing bellies, our families blending into one for the past year,” Teigen wrote Wednesday. “Just minutes before midnight on June 19, 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.”

“We want to say thank you for this incredible gift you have given us, Alexandra,” Teigen continued, revealing the child’s middle name of Alexander is a tribute to the surrogate.

Teigen, 37, and Legend, 44, are also parents to 7-year-old daughter Luna and 4-year-old son Miles. Teigen wrote Wednesday that she always wanted four kids.

Her post included multiple photos, including one of Teigen kissing her surrogate’s pregnant belly and another showing her cradling the child alongside Legend.

“Our hearts, and our home, are officially full,” Teigen wrote. “And to our Jack, we know both their angel kisses are from you.”

Legend — one of 18 people to win an Emmy, Grammy, Oscar and Tony — married Teigen in 2013. Teigen, who starred as a cover model for the Sports Illustrated Swimsuit Issue, has also co-hosted the competition series “Lip Sync Battle” and published three cookbooks.