Gentlemen Prefer Blondes
Dorothy Shaw and Lorelei Lee are showgirls and best friends. Lorelei is engaged to Gus Esmond, who is willing to do and buy anything for her. His father does not approve of her. Lorelei and Gus are planning to sail to France and get married, but Esmond Sr. stops his son. Lorelei wants to go to France anyway and Dorothy accompanies her. Gus warns Lorelei that she has to behave because if his father hears of bad behavior, they will never be allowed to marry. Esmond Sr. has hired a private detective, Ernie Malone, to spy on Lorelei. Malone ends up falling in love with Dorothy. Lorelei meets Sir Francis "Piggy" Beekman who owns a diamond mine. Lorelei uses her charm to entice him.
Lorelei invites him over to the cabin. Unknown to them, Malone is spying through the window and takes pictures of them flirting. Dorothy sees him. She tells Lorelei that Malone has the pictures and the two come up with a scheme to get the film. They invite him to their cabin for drinks and turn the heat up. Lorelei mixes him a strong drink and puts sleeping pills in it. They find the film in his trouser pocket. Piggy is relieved that his wife won't see the pictures. Lorelei suggests to him that as a thank you, he should give her his wife's tiara, persuading him with her charms. Malone has been audiotaping them. In Paris, the women spend everything they have. When they arrive at the hotel, they find out that Lady Beekman doesn't know the truth about the tiara. Considering Lorelei a thief, Gus has stopped her line of credit.
Without money or a place to live, Lorelei and Dorothy get jobs as nightclub singers. Beekman somehow steals back the tiara. When the police come after Lorelei, she is persuaded by Dorothy to return it, but she finds it missing. Gus has come to see the show and Dorothy tells Lorelei that she has to get the money for the tiara from him. In the meantime, she allows the police to arrest her saying that she is Lorelei. At the court, she pretends to be Lorelei. The insurance man has poor sight and only remembers Lorelei's blond hair, unable to recognize that Dorothy is wearing a wig. Dorothy puts on a show in the middle of the courtroom, annoying the judge.
Malone and Esmond Sr. arrive at the airport and see Piggy, who tells Malone to tell Lorelei that he is sorry for what he did. Malone agrees to tell her, and leaves. They arrive at the court to testify against Lorelei, but Dorothy is on the stand and tells Malone that she is in love with him but will never forgive him if he does anything to hurt Lorelei. Malone refuses to testify against her. He realizes who has the tiara and tracks it down to Beekman who is still at the airport. He brings the tiara to the court where it is "legally" returned to its rightful owner, Sir Beekman. Meanwhile, back at the nightclub, Lorelei tells the elder Esmond, "I don't want to marry your son for his money, I want to marry him for your money - because a man being rich is like a girl being pretty." She also explains to him that if he had a daughter, wouldn't he want the best for her and why shouldn't she want those things. Now convinced that Lorelei isn't "stupid" she receives his permission to marry his son. The two girls proceed to have a double wedding. Dorothy marries Malone and Lorelei marries Gus.
