The pair will perform in the UK premiere of the musical at the London Palladium
Samantha Barks and Arthur Darvill will star in the UK premiere of the Broadway musical Honeymoon in Vegas when it is performed in concert at the London Palladium.
The London Musical Theatre Orchestra will perform the musical, conducted by Jason Robert Brown who composed the piece.
Barks made her West End debut as Éponine in Les Miserables, and recently appeared in The Last Five Years, which was written by Brown. She will perform a song from The Last Five Years at the 17th Annual WhatsOnStage Awards with Jonathan Bailey this Sunday.
Arthur Darvill is best known for playing one of Doctor Who's companions in the BBC TV series, and has appeared on stage in Once, Treasure Island and Our Boys.
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The musical is based on the 1992 film which starred Sarah Jessica Parker and Nicholas Cage. It is the story of a man haunted by a promise to his dying mother.
LMTO will return to Cadogan Hall in July for a concert performance of Leonard Bernstein and Hugh Wheeler's Candide.
Honeymoon in Vegas plays the London Palladium on 12 March.