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"I Feel Pretty" is a song from the 1957 musical West Side Story.
The New York Times explained that "Mr. Sondheim...has said he was never particularly fond of his lyrics in “West Side Story,” especially “I Feel Pretty”", later expressing that “The idea of the song is so simple”.
Maria sings about being happy and feeling beautiful because she's in love.
The song was mashed up with the song Unpretty by TLC in a Glee episode to create I Feel Pretty/Unpretty, a duet between Rachel and Quinn. It attempts to show the irony is people feeling pretty on the outside but unpretty on the inside.