Who performed the vocals on the 2003 McDonald’s “I’m Lovin’ It” campaign song?

Justin Timberlake performed the vocals on the 2003 McDonald’s “I’m Lovin’ It” campaign song.

McDonald’s launched “I’m Lovin’ It” as a global advertising campaign in 2003. The campaign used a pop-oriented song and a highly repeatable phrase to give the brand a unified identity across international markets.

The song was produced by The Neptunes, the production team associated with Pharrell Williams and Chad Hugo, and Timberlake provided the featured vocals. That division of roles often creates confusion about who performed the song and who helped create or produce it.

The phrase became McDonald’s long-running global brand tagline. Timberlake’s involvement connected the campaign with contemporary pop culture, while the short wording was designed to work across advertising, packaging, and other customer-facing brand materials.