"Sweet Dreams My LA Ex" is the début single by English singer-songwriter Rachel Stevens. It was released on 15 September 2003 as lead single from her first solo album, Funky Dory. Originally written for Britney Spears, the song was produced by Swedish Bloodshy & Avant, and received a mixed reception from contemporary critics. The single is Stevens's most successful single to date, peaking at number two on the UK Singles Chart. It was the 22nd best-selling single of 2003 in the United Kingdom, selling 210,000 copies. It has sold over 233,000 copies as of 2013.

The name uses a pun on LAX, the IATA airport code for the Los Angeles International Airport.

The lyrics of the song, written by Cathy Dennis, were inspired by Justin Timberlake's "Cry Me a River", which is believed to be aimed at Britney Spears, his ex-girlfriend. The lyrics are a message to the famous ex-lover who has talked about the relationship and break-up in public, with the person in the song now taking the time to deliver their side of the story.

The person in the song wishes their ex "sweet dreams", but accuses them of using the break-up to further themselves. Originally the song was written by Dennis for Britney Spears, who turned it down due to its subject matter. A few months later, Dennis still had not found someone to perform the song and offered it to Stevens, whom she had worked with when Stevens was a member of S Club 7. At the time Stevens had just begun work on her début solo album and thought the song, which did not sound like anything out at the time, would make a good first single. Stevens said of the song in an interview, "The writers really got my personality and the direction I want to go in," she said. "The first single is a great example – the first time I heard it I knew it’s what I wanted."

"Sweet Dreams My LA Ex" received a mixed response from music critics. BBC called the song "perfectly pleasant" but "unlikely to set the world alight, despite heavy rotation on radio and TV". The review also went on to say that while Stevens is popular, she will "need stronger material than this to maintain a pop career past her first album".

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