"La vie en rose" is a French phrase that literally means "life in pink." Figuratively, it means "life through rose-colored glasses" or "the pink-tinged life." This phrase is the title of a famous song by Édith Piaf, Louiguy and Marguerite Monnot.
The phrase can also be interpreted to mean "life in love." The lyrics of the song describe the optimistic view of the world that being in love gives to a person. This song was one of Piaf's most famous tunes, vaulting her to international stardom and inspiring cover versions by artists like Iggy Pop, Grace Jones and Donna Summer. The phrase is also the title of the 2007 biopic about Piaf starring Marion Cotillard.