Which singer recorded the vocal track used in McDonald's 2003 “I'm Lovin' It” campaign?

Justin Timberlake recorded the vocal track used in McDonald's 2003 “I'm Lovin' It” campaign. His involvement gave the launch a strong connection to contemporary pop music and helped the advertising platform gain attention beyond traditional restaurant commercials.

The campaign was not simply a Timberlake song repurposed by McDonald's. German agency Heye & Partner developed the concept, and the brand commissioned music and advertising materials for a worldwide rollout. Timberlake's recorded performance was one part of that broader campaign.

People sometimes credit Timberlake as the sole creator of the tagline or campaign. The branding effort involved agencies, producers, songwriters, and McDonald's marketing teams. The phrase itself became the enduring brand element, while the music supported its initial introduction.