If you want a biography of Cole Porter you better go to the library, you won't find it here. This is a highly entertaining but strictly fictional version of his life--played by no less than Cary Grant, in his usual debonair style, perhaps just a shade understated so as to appear more like Porter. Whatever, he's still Cary Grant (playing himself in a minor key) and since the music is what makes this film tick, you'll forgive whatever liberties the scriptwriters have taken. It all looks wonderful in glowing technicolor.
Alexis Smith never was able to make a warm presence on the screen despite her talent and striking good looks. She seems even more remote here as the woman Porter woos and marries. Monty Woolley has a fine time playing himself. The musical moments are handled nicely by some talented people: Ginny Simms, Eve Arden, Jane Wyman and Mary Martin doing her "My Heart Belongs to Daddy" routine. All of the Porter standards are nicely done.
Interesting tidbit: Was Oscar nominated for "Best Scoring of a Musical" but lost to "The Jolson Story".
Relaxing entertainment. Just don't expect a truthful bio.