"Don't You Know?" is a 1959 popular song by written by Bobby Worth, and a hit record for singer Della Reese.
The song was adapted from an aria ("Muzetta's Waltz") from Puccini's La Boheme. It became Reese's biggest hit, reaching #2 on the US Pop charts and #1 on the US Black Singles Charts (now called the R&B charts). The song was a follow-up to her previous big hit "And That Reminds Me".
The song was Reese's first single on her new label RCA Records. The song helped Reese get a nomination for a Grammy Award for Best Female Vocalist. It also led to nine years in Las Vegas. Reese would go on to have a successful career in television and films.
Later recorded versions include those by Jerry Vale, Vic Damone, and Bobby Vinton.
