"4x4" is a song by American recording artist Miley Cyrus featuring American rapper Nelly from Cyrus' fourth studio album Bangerz (2013). It was written and produced by Pharrell Williams, with additional songwriting provided by Cyrus and Nelly. The song is a country rap track that discusses having fun through the metaphor of a 4x4 truck. The song is sampled in British indie rock band Alt-J's 2014 single "Hunger of the Pine".

"4x4" received generally favorable reviews from contemporary music critics, who appreciated its overall production and individuality compared to the other tracks included on Bangerz. Despite not having been released as a single, it peaked at number 41 on the U.S. Billboard Pop Digital Songs chart. Cyrus first performed the song during her episode of MTV Unplugged in January 2014, and has also performed it during her Bangerz Tour. In August 2014, Ubisoft revealed that the song will appear in Just Dance 2015.

In 2012, Cyrus announced plans to focus on her film career, effectively putting her musical endeavors on hiatus. That year, she appeared in the films LOL and So Undercover. She was also confirmed as a primary voice actress in the feature film Hotel Transylvania, but dropped out of the project to coordinate a musical comeback. In January 2013, Cyrus ended her recording contract with Hollywood Records, under which she released the studio albums Meet Miley Cyrus (2007), Breakout (2008), Can't Be Tamed (2010), and the extended play (EP) The Time of Our Lives (2009). Later that month, she signed a recording contract with RCA Records. In March, she confirmed that her fourth studio album would be released by the end of 2013.

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