Which musician provided the lead vocals associated with McDonald’s 2003 “I’m lovin’ it” campaign?

Justin Timberlake provided the lead vocals associated with McDonald’s 2003 “I’m lovin’ it” campaign.

The campaign used a song recorded by Timberlake, whose vocals helped connect the advertising phrase with contemporary pop music. The song and slogan were developed as part of McDonald’s worldwide branding effort, which launched in 2003 and used the same central idea across multiple markets.

Timberlake’s involvement is one reason the campaign is often discussed as a crossover between advertising and popular music. The musical hook became more famous than a conventional commercial jingle, while the phrase itself became McDonald’s global tagline.

The campaign’s music is sometimes attributed entirely to Timberlake or to a single songwriter. In reality, several people were involved in writing, producing, and adapting the campaign material; Timberlake is best known for performing the associated vocals.