Forbidden

Forbidden is a movie starring Barbara Stanwyck, Adolphe Menjou, and Ralph Bellamy. A librarian takes a cruise and falls for an unobtainable man, a district attorney married to an invalid.
On a cruise to Cuba, Lulu Smith falls in love with Bob Grover. Back home, she breaks off the romance when he tells her he is married. Lulu has a baby, but doesn't tell Bob, who turns out to be a rising politician. She passes herself off as the baby's nanny. When Bob learns what is going on, he adopts the little girl, not telling his wife or anyone else where she came from. Lulu gets a job at a newspaper. Things get complicated when the editor gets the dirt on Grover, but also wants to marry Lulu