When Broadway showgirl Mona Leslie is hauled off to jail for reckless driving, Granny, her grandmother, goes to sports promoter Ned Riley for help.  Granny trusts Ned and knows that he is in love with her granddaughter.  Ned springs Mona from the House of Detention for Women just in time for her benefit performance for an organization known only as the S.A.M.L.  Mona takes the stage only to discover there is only one man in the audience, her admirer, Bob Harrison, who admits that he is the president and sole member of the S.A.M.L., which stands for the Society for the Admiration of Mona Leslie.

Bob, an heir to an immense oil fortune, is soon joined by Ned, with whom he is engaged in a friendly romantic rivalry, and the two men watch with pleasure as Mona performs her song and dance routine.  Following the performance, Ned allows Bob to take Mona on a date, but only because he knows that she will be taken back to the House of Detention when she steps outside.  Mona is soon released and, while their romance makes headlines, the two spend an afternoon at an amusement park, where Bob kisses Mona. 

Later, Granny reminds Ned that it was he who helped Mona start her professional career and urges him to pursue his interests in her, believing that she will leave Bob if he asks her.  Soon after, however, Ned reads in the newspapers that Mona has eloped with Bob and becomes depressed.

While Bob and Mona are on their way to meet his parents, Mona reads in the newspaper that Bob jilted his childhood sweetheart, Jo Mercer, to marry her.  Upon their arrival, Bob's father, Colonel H. Harrison, makes an obvious show of his displeasure at his son's decision to marry a "Broadway bride."  To everyone's surprise, Jo is remarkably demure about Bob's marriage, so much so that she forgets Bob and marries Ralph Watson.

At Jo's wedding, Bob, who is still in love with Jo, becomes melancholy and, after drinking, picks a fight with Ned.  Ned and Mona leave, but Bob follows them to Ned's room, where he bursts in, quarrels with them and then commits suicide.  Both Mona and Ned are accused of murdering Bob, but a trial proves their innocence.

After Mona gives birth to Bob's son, who will be the future heir to the Harrison fortunes, the newspapers report on the bitter custody battle being waged by Mona and Harrison.  With her reputation sullied, Mona makes an attempt to escape further controversy by leaving with her son and promising Harrison that she will not lay any claim to his money.  Unfortunately, Mona's troubles continue when she attempts to make a stage comeback and is heckled by an audience that believes the lies that have been printed about her.  Forced to stop in the middle of a song, Mona makes a desperate appeal to the audience and asks them to allow her to finish her song, which she believes is her last.  Moved by her speech and her song, the crowd applauds Mona, and Ned proposes marriage.