"Happy Birthday, Mr. President" is a song sung by actress and singer Marilyn Monroe on May 19, 1962, for President John F. Kennedy at a celebration of his 45th birthday, 10 days before the actual date (May 29).
Monroe sang the traditional "Happy Birthday to You" lyrics in a sultry, intimate voice, with "Mr. President" inserted as Kennedy's name. She continued the song with a snippet from the classic song, "Thanks for the Memory", for which she had written new lyrics specifically aimed at Kennedy.
Thanks, Mr. President For all the things you've done The battles that you've won The way you deal with U.S. Steel And our problems by the ton We thank you so much
Afterwards, as an enormous birthday cake was presented to him, President Kennedy came on stage and joked about Monroe's version of the song, saying, "I can now retire from politics after having had Happy Birthday sung to me in such a sweet, wholesome way," alluding to Marilyn's delivery, skintight dress, and image as a sex symbol.
The performance was one of her last major public appearances before her death less than three months later on August 4, 1962.