Which singer was featured on the original McDonald's “I'm Lovin' It” campaign track?

Justin Timberlake was featured on the original McDonald's “I'm Lovin' It” campaign track.

The campaign launched in 2003 with music connected to Timberlake, whose vocals helped give the advertising platform a contemporary pop identity. The phrase became closely linked to the song and jingle used in McDonald's international marketing.

The campaign involved creative work from several contributors, including the advertising agency Heye & Partner and the music producer Pharrell Williams. Those additional credits sometimes lead to confusion about who performed the featured vocal.

Timberlake's involvement was part of McDonald's effort to connect its branding with popular music and youth culture. The slogan outlasted the initial music rollout and became a standalone verbal signature used in later advertising.