TheDownton Abbeystar, 38, is expecting his first child with his wife, actressJessica Blair Herman, his rep confirms to PEOPLE.

The Irish star praised his actress wife as “absolutely blooming” in a red-carpet conversation with U.K. outletThe Sun, sharing that she is five months along and he is “nervous” about becoming a first-time father.

Additionally, he told the publication, “I hope the movie does well!”

Jessica Blair Herman (L) and Allen Leech.

Jessica Blair Herman and Allen Leech

Leech and Herman wed on Jan. 5 in California’s Santa Ynez Valley,according toHELLO!, and spoke to PEOPLE laterthat month about their first meeting— at anEntertainment WeeklySAG awardsafterparty three years ago.

Jessica Blair Herman (L) and Allen Leech.Ian West/PA Images via Getty

Jessica Blair Herman and Allen Leech

“I approached Jessica, who at the time, I think you were dancing with the girls fromOrange Is the New Black, and I saw you dancing,” Leech recalled to PEOPLE’sJeremy Parsons.

“A friend of mine, Tom, we were about to leave the party and being Irish and having two rubber arms, he said, ‘Do you want one more drink?’ ” he continued. “And I said, ‘Yeah, okay,’ went in, ordered, turned around, saw this vision in a velvet dress and said, ‘Tommy, I’m going to dance with that girl.’ ”

“Then we got married three weeks ago,” said Herman, who has acted in numerous television roles including onAmerican Crime StoryandModern Family.

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RELATED VIDEO: Allen Leech Reveals the Romantic Story of How He Met His Wife at anEWParty!

The couple’s wedding had many A-list guests in attendance including fellowDowntown AbbeystarMichelle Dockeryand Leech’sBohemian RhapsodycostarRami Malek— as well asLea MicheleandDarren Criss, who sang a duet.

Leech first revealed that he wasengaged to Hermanvia social media in February 2018, writing alongsidea selfie of the pairon Instagram, “Happy Valentine’s Day@jessicablairherman.”

“First one as a fiancé!” he added, breaking the news of their then-impending nuptials. “Thank you for saying yes and for making me the happiest.”

Downton Abbeyhits U.S. theaters on Sept. 20.

source: people.com