Which singer performed the vocals on McDonald’s original 2003 “I’m Lovin’ It” single?

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

The campaign began as a global branding platform in 2003, pairing the phrase with a pop-oriented song and music video. Timberlake’s vocal performance helped connect the McDonald’s slogan with contemporary popular culture rather than presenting it only as a traditional advertising jingle.

The campaign involved work by several music and advertising professionals, which is why credits are sometimes confused. Pharrell Williams was involved in production and songwriting, while the German agency Heye & Partner helped develop the campaign concept. Timberlake provided the prominent recorded vocals.

The slogan later became McDonald’s best-known worldwide advertising line. The song and the slogan are related but not identical: the question concerns the singer on the original promotional single, not the later general use of the phrase.