"Let's Get Crazy" is a song by American singer–songwriter and actress Miley Cyrus, performing as Hannah Montana – the alter ego of Miley Stewart – a character she played on the Disney Channel television series Hannah Montana. It was released to Radio Disney on January 19, 2009 as promotion for Hannah Montana: The Movie and its soundtrack. The song is also included on the Hannah Montana 3 soundtrack. A karaoke version is available in Disney's Karaoke Series: Hannah Montana 3. The song is musically dance-rock based. Lyrically, the track speaks about having fun and cutting loose.

The song received critical success and garnered average commercial outcomes for Cyrus in several countries, compared to those of her previous efforts as Montana. This includes Canada and the United States. The song reached its highest international peak in the Canadian Hot 100, at number twenty-six. It therefore became Cyrus' highest charting song in Canada, as Montana. The song never received an official music video, but three promotional music video were, of which two aired on Disney Channel. Cyrus promoted the song through several venues, including a performance on her second headlining tour, the Wonder World Tour.

The song is associated with dance-rock with a slight country twang.Electric guitars and synths are also used. Near the start, the song begins to make a beat of paparazzi's flashbulbs. It is set in common time with a moderated tempo of 120 beats per minute. The song is written in the key of A minor. Cyrus' vocals span two octaves, from A₃ to C₅. The song has the following chord progression, A5—C5—D5.

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