"A Public Affair" is a song recorded by American recording artist Jessica Simpson. It was co-written by Simpson and produced by Lester Mendez, for Simpson's fourth studio album of the same title. It was released as the album's first single (second overall) on June 29, 2006 by Epic Records. Musically, the song is a dance track with disco influences. It samples the melody of "Holiday" by Madonna and interpolates the Diana Ross classic "Ain't No Mountain High Enough". Lyrically, the song speaks about having fun with friends.
"A Public Affair" received mixed reviews from critics, with many criticizing its close similarity with "Holiday". The song reached the top ten in Canada and Ireland and made the top twenty in US, Australia and UK. The song also topped the Billboard Hot Dance Club Play charts, becoming Simpson's first number one on the chart. The song ranked at number 51 on Top 100 Pop Songs of 2006 by About.com.