Which singer provided vocals for McDonald's best-known “I'm Lovin' It” campaign recording?

Justin Timberlake provided vocals for McDonald's best-known “I'm Lovin' It” campaign recording.

The recording was part of the campaign launched in 2003. Timberlake's vocal performance helped turn the short musical phrase into a widely recognized piece of advertising music. His participation is sometimes misunderstood because the campaign was created by a group of advertising, music, and production professionals rather than being presented as a conventional solo pop release.

The song and slogan have several connected credits. Pharrell Williams was involved in the music's development and production, while the advertising concept was associated with the German agency Heye & Partner. Timberlake's vocals appeared in the commercial version and related releases. The campaign was built for worldwide adaptation, so different markets sometimes used localized lyrics, performers, or arrangements while keeping the central hook. This is why the singer's credit is distinct from the people credited with creating the slogan or producing the music.