Which singer provided the vocals for McDonald's “I'm lovin' it” campaign song?

Justin Timberlake provided the vocals for McDonald's “I'm lovin' it” campaign song.

The campaign launched internationally in 2003 and used the phrase “I'm lovin' it” as a major McDonald's brand line. Timberlake recorded the song associated with the campaign, helping connect the advertising slogan with a contemporary pop-music performance.

The campaign's music is sometimes confused with the advertising agency or producers responsible for developing the broader concept. Heye & Partner created the campaign concept, while the song and its production involved several music professionals. Timberlake's role was as the featured vocalist.

The phrase became one of McDonald's most recognizable global branding elements. It was adapted for different markets, but the English wording and its musical identity became especially prominent in the company's international advertising. The campaign also marked a shift toward linking fast-food branding with mainstream entertainment and pop culture.