Here Comes the Groom (1951)

Pete Garvey, foreign correspondent, has been running an impromptu adoption agency for war orphans in Paris, when an ultimatum from his erstwhile fiancée Emmadel Jones draws him back to Boston, complete with two adopted orphans to melt her heart. Too late! She's now engaged to rich, handsome Wilbur Stanley. And if Pete's not married within five days, he loses the kids. He'll have to work fast...