Britney & Kevin: Chaotic is the first extended play (EP) by American recording artist Britney Spears. It was released on September 27, 2005 by JIVE Records as a bonus CD to Britney & Kevin: Chaotic... the DVD & More and as a digital download. The EP features three songs: "Chaotic", "Someday (I Will Understand)" and "Mona Lisa".

In July 2004, Spears announced her engagement to American dancer Kevin Federline, whom she had met three months before. The romance received intense attention from the media, since Federline had recently broken up with actress Shar Jackson, who was still pregnant with their second child at the time. The initial stages of their relationship were chronicled in Spears's first reality show Britney and Kevin: Chaotic, which aired on UPN in the spring of 2005. They held a wedding ceremony on September 18, 2004, but were not legally married until three weeks later on October 6 due to a delay finalizing the couple's prenuptial agreement. In October 2004, the singer announced she would be taking another career break to start a family.

On December 30, 2004, Spears made a surprise appearance at the Los Angeles radio station KIIS-FM to premiere a rough mix of a new mid-tempo track "Mona Lisa". Spears had recorded the song live with her band during The Onyx Hotel Tour. She dedicated the song to all the "legends and icons out there". The lyrics lament the fall of Mona Lisa, calling her "unforgettable" and "unpredictable", and cautions listeners not to have a "breakdown". She also revealed she wanted the song to be the first single of her upcoming album, tentatively titled The Original Doll and hoped to release it "probably before summertime [2005], or maybe a little sooner than that". In January 2005, Spears posted another letter on her website, saying,

I think I should rephrase myself from my previous letters when I was talking about taking a 'break'. What I meant was I am taking a break from being told what to do. ... It's cool when you look at someone and don't know whether they are at work or play since it's all the same to them. The things I've been doing for work lately have been so much fun, because it's not like work to me anymore. I've been even more 'hands on' in my management and the business side of things, and I feel more in control than ever.

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