The Diary (You Think You Know) is the second unreleased album by American rapper, Charli Baltimore. The album was to be her official solo debut album (after the cancellation of her other album, Cold as Ice), it was also expected to be Charli's big comeback. The album spawned a total of five buzz singles but none of them managed to chart. Because of the lack of charting performance from her singles and with no promotion from her label, the album was shelved.

After striking a deal with Murder Inc. Records CEO Irv Gotti, Charli began recording the album in 2001 under the label. Most of the material from the album was recorded in Soundtrack Studios, Manhattan, New York City.

During recording sessions, former labelmates claimed that Charli would have numerous songs completed and the quantity of them would be more than what producers, Irv Gotti and Chink Santana would have instrumental beats finished for her. At one point, a rumored power outage occurred at the studio, where she and producers were working at, and shortly after the shenanigan was resolved, Charli had recorded a total of 12 songs within that same night.

In 2002, it was revealed that she had named her album, The Diary; she had confirmed it was inspired by the early 2000s reality show of the same name. Charli briefly explained to MTV in a 2002 interview about the concept of the album:

The album spawned five buzz singles in hopes of creating buzz for the album:

The album was originally slated to be released on September 10, 2002, however the cancellation of her single, "Hey Charli" pushed the album back to the 4th quarter of 2002. Shortly after the release of Charli's former home label, Murder Inc.'s compilation, Irv Gotti Presents: The Remixes, it was revealed via the album, and briefly reported by MTV, that The Diary would be released on December 3, 2002. Following the announcement, more buzz singles from the album were released but failed to chart, thus her label pushed the album to a release sometime in the Summer of 2003. Months prior to the release of her album, Charli was slated to release her next single, "Charli, Charli", however due to undisclosed reasons the single was cancelled, Charli left the label and the album was shelved.

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