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Downton's Michelle to marry her Irish beau

Downton Abbey star Michelle Dockery is engaged to her Irish boyfriend John Dineen.

The British actress, who plays Lady Mary on ITV's popular period drama, has been dating the finance PR professional for a year and a half.

The couple began their relationship in September 2013 after they were introduced by Dockery's Irish co-star Allen Leech, who plays chauffeur turned member of the gentry Tom Branson.

Sources revealed that Michelle (33) showed off her new diamond ring during a recent read-through session with her Downton Abbey co-stars.

Friends of the star said that she is delighted to be marrying the Irishman, who hails from Waterfall, Co Cork.

"She's over the moon and was showing the ring off to all of the cast and crew. She knows it's for keeps," a source said.

"It's wonderful news and everyone is delighted. She and John make a lovely couple."