Which singer performed the promotional song linked to McDonald's 2003 “I'm Lovin' It” campaign?

Justin Timberlake performed the promotional song linked to McDonald's 2003 “I'm Lovin' It” campaign.

The campaign used a pop-oriented musical identity to make McDonald's branding feel contemporary and internationally recognizable. Timberlake recorded the song “I'm Lovin' It,” which was released in connection with the advertising campaign and helped turn the slogan into a widely heard audio signature.

The advertising line and the song are related but not identical concepts. McDonald's used the phrase as its global slogan, while Timberlake's recording served as the associated promotional track. The company also used the campaign in multiple languages and markets.

A frequent mix-up is attributing the song to a later pop artist because the campaign's jingle became more prominent than the original recording. The credited performer for the promotional song is Timberlake.