The Hollywood debut of German star Lillian Harvey, this film operetta was held back in favor of Harvey's second outing, My Weakness (1933), which, despite its title, was considered a stronger effort. In My Lips Betray, the erstwhile star of Congress Dances plays Lili, a café singer mistakenly believed to be the mistress of King Rupert of Rutania. A composer of love songs in his spare time, the King (John Boles) is immediately smitten with both Lili's voice and Lili herself. The girl, however, erroneously takes him for a mere captain of the guard and keeps up the charade that has made her popular all over the land. Rutania is in dire economic strains, meanwhile, and Rupert is all but forced to marry a wealthy foreign princess. But when the latter hears about her fiancé's supposed dalliance with a café chanteuse, she elopes to Paris with a tango dancer and Rutania once again faces bankruptcy. Happily, there is oil in them thar hills and King Rupert is finally free to tell Lili the truth and ask her to become his queen. Lillian Harvey and John Boles take time out from romance to sing "I'll Build a Nest," "To Romance," and "Why Am I Happy?," all by William Kernell, while comic relief El Brendel performs "His Majesty's Car."
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