Betty is an Edwardian musical comedy in three acts, with a book by Frederick Lonsdale and Gladys Unger, music by Paul Rubens and Ernest Steffan [de], and lyrics by Adrian Ross and Rubens.

Gerard, the Earl of Beverley, a philanderer, has pushed his father, The Duke of Crowborough, to the limit.

The Duke storms into his son's home demanding that the younger man settle down with a wife and take on some responsibility.

The young Earl, drunk and embarrassed in front of his friends, proposes to Betty, a kitchen maid, to spite his father.

Gerard has no intention of following his father's wishes and makes plans to send Betty away and to continue with his profligate lifestyle.