"Shampain" is a song by Welsh singer and songwriter Marina and the Diamonds from her debut studio album, The Family Jewels (2010). It was released on 11 October 2010 as the album's fifth and final single only in the United Kingdom and Ireland.

When asked what "Shampain" was about and the production behind the song, Diamandis said:

"['Shampain' is about] the depressing side of getting drunk, the obliteration side of having a good time. This was actually the first co-write that I ever did... It was good to write a simpler pop song because when I write on my own the melodies are all over the place. It was good to do something a little bit lighter, and this probably is my lightest track on a record. It's about insomnia and the joys of champagne."

On co-writing, she added: "I hate [co-writing] so I do it because it's so challenging for me. As soon as I do it I am really pleased that I have. I've had the pleasure of working with three great people... 'Shampain' was written with Pascal Gabriel, Liam Howe and we had a lot of fun doing it."

"Shampain" was used in an episode of the BBC Switch teen soap opera The Cut in December 2009. The song had the working title of "The Shampain Sleeper" in 2009.

In 2012, Diamandis expressed her dislike of the song in an interview with BBC Radio 1's Live Lounge, stating it would have been better suited for Kylie Minogue and that its inclusion on the album was by force.

John Murphy of musicOMH described "Shampain" as "infectiously catchy and [has] enough depth not to be dismissed lightly as bubblegum pop." James Berry of Yahoo! Music stated the song "bucks like Goldfrapp riding The Killers' bronco". A number of critics had commented negatively regarding the title of the song. Gareth James from Clash opined that the song "feel[s] a little forced".The Independent's Andy Gill wrote that "Shampain" is "every bit as annoying as [its] punning title, with queasy, prancing piano and synth figures labouring away methodically, Mika-fashion, while she searches unsuccessfully for worthwhile lyrical routes."

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