The actor and his fiancée Amanda Pacheco are currently expecting their first child, a daughter

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Wilmer Valderrama is showing gratitude for the greatest birthday present: his expanding family.

The NCIS actor turned 41 years old over the weekend, commemorating the birthday in an Instagram post on Tuesday, in which he poses with his pregnant fiancée Amanda Pacheco on the beach. In one snapshot, Valderrama kisses her bare baby bump, expressing in the caption his excitement for their first child, a daughter.

"Now THIS is 41," he writes. "Thank you to absolutely everyone who posted and send me such beautiful messages and wishes.. by the look of these pics.. some of those wishes came true.. I love you all mucho! Thank you Amanda for my last bday gift before becoming a papa... you."

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Wilmer Valderrama
Credit: Wilmer Valderrama/Instagram

The couple, who became engaged in January 2020, announced their pregnancy news in December.

Pacheco showed off her pregnancy figure in photos shared last month, including one that sees Valderrama embracing her.

"Holding our precious little..._____!!Boy or girl ?!😬," she teased in the caption prior to revealing the sex of their baby girl on the way.

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In July, the That '70s Show alum and Pacheco celebrated their anniversary with tributes on social media.

"Our passports have become diaries that now witness the great adventure we now call OUR life.. here's to keep collecting stamps and making it look easy... cause why does it have to be anything but a sunset sail, I mean... #ItsJustUsNow #FelizAniversario mi Chimichurri," he wrote at the time alongside a selfie of the pair.

"In a world full of uncertainty, we will always have our adventures. Happy anniversary mi prometido PS you make a really good face mask," the mom-to-be wrote with her photo.

And for her birthday in August, Valderrama showered his fiancée with lots of love. "Feliz cumpleaños to my Chimichurri, I love you, today let's celebrate by doing what we do best, live and laugh louder than yesterday. Lord, thank you for leading my ship till I found my mermaid," he said on Instagram.