Allen Leech has married American Crime Story actress Jessica Blair Herman.
The 37-year-old Irish actor is best known for his role as Tom Branson in Downton Abbey.
He recently starred in gritty BBC drama Doing Money.
The secret wedding ceremony was held on Saturday at an exclusive estate in Santa Barbara, California, Hello! magazine reports.
Leech and Herman announced their engagement on Valentine’s Day last year after two years of dating.
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Leech’s Downton Abbey co-stars Michelle Dockery (Lady Mary) and Dan Stevens (Matthew Crawley) were amongst the wedding guests.
Also in attendance was American actor Rami Malek, who starred as Freddie Mercury in Bohemian Rhapsody, in which Leech played the singer’s manager.
Downton star Jim Carter was made an OBE as part of the Queen’s New Year Honours list earlier this month.
Downton Abbey: The Complete Collection DVD box set is available on Amazon.