Which pop singer appeared in the 2003 McDonald's “I'm Lovin' It” campaign and recorded its theme?

Justin Timberlake appeared in the 2003 McDonald's “I'm Lovin' It” campaign and recorded its theme.

The campaign launched in 2003 and used the phrase “I'm Lovin' It” as McDonald's global brand message. Timberlake appeared in campaign material and recorded a version of the accompanying song, helping connect the slogan with contemporary pop culture.

The music originated in a broader creative process involving the German hip-hop group the Wiseguys and producer Pharrell Williams. McDonald's then developed the material into a worldwide advertising campaign, making the short phrase and five-note musical hook central parts of its identity.

Timberlake's role is sometimes mistaken for authorship of the entire campaign song. He was the featured recording artist and on-screen celebrity, while the campaign involved multiple writers, producers, and versions.