"Dirrty" is a song recorded by American recording artists Christina Aguilera and Redman for the former's fourth studio album Stripped (2002). Despite Aguilera's first three years of commercial success, she was displeased with the lack of control over her image. In response, she desired to create a song that would represent her authentic persona. She approached hip hop producer Rockwilder and suggested using Redman's 2001 song "Let's Get Dirty (I Can't Get in da Club)" as a guide. The final result, "Dirrty", is an R&B and hip hop song that also features rapping verses from Redman. The song is about sexual activities.

RCA Records sent "Dirrty" to American radio stations in September 2002 as the lead single from Stripped. RCA and Sony Music Entertainment later released the song as a CD single. The single was Aguilera's first to fail to enter the top twenty of the US Billboard Hot 100, where it peaked at number forty eight. Outside the United States, "Dirrty" saw significant success in the British Isles, topping the charts in both the Republic of Ireland and the United Kingdom. Elsewhere, the song peaked within the top ten of the charts in countries including Australia, Denmark, the Netherlands, and Switzerland.

The music video for "Dirrty", directed by David LaChapelle, was intended to publicize Aguilera's new image. It depicts sexual fetishes such as mud wrestling and muscle worshipping. The controversial video eliminated her image as a bubblegum pop singer. It received criticism from various news publications and other recording artists, and it was banned on Thai television due to its sexual content. Aguilera defended the video, calling it inspirational as it put her to the forefront. "Dirrty" was included on the setlists of Aguilera's three major concert tours: the Justified and Stripped Tour (2003), the Stripped Tour (2003), and the Back to Basics Tour (2006–08).

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