"Tell Me Something I Don't Know" is a song performed by Selena Gomez. The song was released as the lead single from Another Cinderella Story soundtrack on August 5, 2008. and a Radio Disney version (which removes the Hurricane Katrina reference) was released on September 9, 2008, on iTunes.

A different version was featured from the album Kiss & Tell (2009) by Selena Gomez & the Scene.

The song peaked at number 58 on the US Billboard Hot 100 chart and at 13 on the Australian Hitseekers Singles chart. As of July 2015, the song has sold 1.1 million copies in the United States.

The music video starts with scenes reminiscent of (but not from) the film; Gomez cleaning a house and the maid yelling at her. Gomez then leaves the house and performs a dance routine with her backup dancers, while the maid watches from the house window. The video also features Gomez in front of a black background with lyrics from the song (such as "I'm ready for it" and "One in a million") flying around her. The video was directed by Elliott Lester.

^*sales figures based on certification alone
^{^}shipments figures based on certification alone

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