Photos: Ashton Kutcher shares first photo of baby with Mila Kunis. Meet the adorable Wyatt Kutcher...

In a statement on his website, Kutcher said, “Mila and I would like to welcome Wyatt Isabelle Kutcher to the world.

“May your life be filled with wonder, love, laughter, health, happiness, curiosity, and privacy.”

Kutcher teased fans by sharing eight photos, (six of which were babies, two of which were animals) and said, “Can you guess which one is ours, or does it really matter? All babies are cute”.

In what seemed like the longest pregnancy in history, Mila Kunis and Ashton Kutcher welcomed their first child together on Tuesday night.

Kunis delivered her first born at Cedars-Sinai Medical Clinic in Los Angeles, a hospital favoured by many celebrities. The pair are said to have arrived at the hospital by themselves, with no entourage or family, at around 6am Tuesday morning and Kunis was taken straight to the delivery room.

See more photos after the cut...

They were last seen together on Saturday taking their two dogs to a park in Hollywood. Prior to that, the 31-year-old mum-to-be was photographed heading to her favourite yoga class in L.A., revealing her enormous baby bump in a tight black tank top and tracksuit pants.

In the weeks prior to the birth, Kutcher, 36, was reportedly keeping a watchful eye on his pregnant fiancee. “Ashton is not letting Mila out of his sight. They are spending every moment together,” a source told E! News. “He can’t wait.”

The source added: “Mila is so excited about the baby. She’s not nervous at all. She’s been really calm and chill about it all.”