The song Miss Patty and Babette together at the wedding, while Morey plays piano. It’s a popular 1950 song by Irving Berlin, first performed by Ethel Merman and Russell Nype in the Broadway musical Call Me Madam; Merman later reprised her role for the 1953 film version, featuring the song as a duet with Donald O’Connor [pictured]. The song has been recorded several times, most successfully by Perry Como and the Fontana Sisters, who reached #5 in the charts for 1950.
The lyrics of the song give the message, You’re not sick, you’re just in love – a callback to Rory crying that she must be “sick” to have cut school to see Jess in New York. Now Lorelai has done something even more questionable, and the song is telling the Gilmore girls (and Jess?) that they’re not sick in the head, they are simply in love.
The Annotated Gilmore Girls 