"Mademoiselle Juliette" (English: "miss Juliet") is a song by French singer Alizée, which was released as the first single from her third studio album Psychédélices,. It was released on 30 September 2007, Alizée's first single in 4 years, the past being "À contre-courant" which was released in October 2003.

The song was released on 30 September 2007. Alizée appeared on French radio station NRJ three days before the release to promote the song. The single was first made available on the online French music store of Virgin Megastores on 27 September 2007. However, it was rapidly removed a few hours later, and was reported to be a mistake on Virgin's behalf. The song was later added back again the day of the official release.

"Mademoiselle Juliette" is a pop song. The song is set in Common time with a tempo of 130 beats per minute. The song is written in the key of F major. The song begins with techno synths playing followed by vocals and drum beat, then progresses into fast tempo electropop beat with twinkling synths played by guitars, synthesizer keyboards, and snare drums.

Lyrically, the song "Mademoiselle Juliette" portray Juliet Capulet from Romeo and Juliet, the drama by William Shakespeare, as a girl who would rather party than worry about the Montague-Capulet dispute.

The video was released on 19 November 2007. In the video Alizée is dancing and having fun in a French mansion. The music video was directed by Julien Rotterman and shot during one day on the north side of Paris, in château of Champlâtreux. On 30 November 2007 the Rotterman released a director's cut version of the music video.

The video reached #1 in the MTV Latin, in a show called Los 10 + Pedidos. On the same channell, it reached place 138 in the cowntdown of 150 most important videos in the past 15 years.

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