Tom Branson, or rather actor Allen Leech, is off the market.

The 36-year-old thesp took to Instagram to reveal he had popped the question to his tv star girlfriend Jessica Blair Herman.

The Dublin native has been dating the American Crime Story actress since 2016.

Leech, best known for his role in drama "Downton Abbey", lives in Los Angeles with Herman.

Herman, who is also a producer, shared a sweet image of the couple on Valentine's Day writing, "The day you proposed was one of the best days but every day with you is my favorite. I love you!"

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A post shared by Jessica Blair Herman (@jessicablairherman) on

Leech previously dated Sky Sports presented Charlie Webster. The pair parted ways in December 2015.

The actor has just wrapped production on "Bohemian Rhapsody" a biopic about the life of Queen's Freddie Mercury.

Allen Leech is engaged to Jessica Blair HermanInstagram