with Van Johnson
In the Good Old Summertime (1949) was a remake of Shop Around the Corner, which had starred James Stewart and Margaret Sullavan nine years earlier.  Reborn as a colorful musical, it's just as enjoyable as the original.

Judy and Van Johnson play a pair of co-workers who are constantly bickering -- in fact, they can hardly stand the sight of each other.  Yet each has a secret pen-pal with whom they fall in love (by mail), and, you guessed it -- it turns out they are writing to each other!

Judy's flair for comedy is delicious in her initial meeting with Van, where they both get increasingly tangled up with her dress, his bicycle, her hair, his gloves, her hat, its ornaments ("Here's your bird...") --  leaving her a disheveled wreck as he cycles happily away.

Summertime is full of barbershop-quartet-era charm, and has Judy singing "Meet Me Tonight in Dreamland", "I Don't Care", and "Put Your Arms Around Me, Honey" with her usual fervor.