Neptune's Daughter (1949)

Aquatic dancer Eve Barrett (Esther Williams), now partnered with Joe Backett (Keenan Wynn) in a swimsuit design company, tries to prevent her sister, Betty (Betty Garrett), from falling in love with Jose O'Rourke (Ricardo Montalban), a suave South American polo player. Unbeknownst to Eve, Betty has actually fallen for Jack Spratt (Red Skelton), a masseuse who is posing as Jose. To protect her sister, Eve finds the real Jose, agrees to a date and also falls in love.