"Keeps Gettin' Better" is a song by American singer Christina Aguilera, taken from her first greatest hits album, Keeps Gettin' Better: A Decade of Hits (2008). It was released on September 9, 2008, by RCA Records as the only single from the album. The song was written and produced by Linda Perry, with additional songwriting from Aguilera. After giving birth to her son Max, she looked to "come up with something new and fresh", developing a "futuristic" era of her career. "Keeps Gettin' Better" is an electroclash and electropop song, and was inspired by the likes of Andy Warhol and Goldfrapp. Its lyrics portray Aguilera as a superhero.

Upon its release, "Keeps Gettin' Better" received generally mixed reviews from music critics. At a time when dance music was becoming increasingly prominent, the song was criticized for its lack of originality, but was deemed "catchy" and a welcome change from Aguilera's fifth studio album Back to Basics (2006). It became Aguilera's highest debut on the US Billboard Hot 100 at number seven. The song additionally topped the US Hot Dance Club Play chart. Elsewhere, it peaked at number four in Canada, while charting inside the top twenty in Austria, Germany, Ireland, Italy, Japan, Slovakia and the United Kingdom.

The accompanying music video, directed by Peter Berg, features Aguilera in an editing room, producing the music video on a green screen. Using the equipment there, she creates several characters, including a blonde 1960's inspired hippie character, another based on Catwoman and a futuristic blue-haired version of herself. Aguilera debuted the song during a live performance at the 2008 MTV Video Music Awards. Wearing a catsuit, she sang a remixed version of her debut single "Genie in a Bottle" (1999), before performing "Keeps Gettin' Better". Aguilera also performed the song during a promotional tour for the album, and as part of a medley of her greatest hits on the 36th Annual American Music Awards.

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