Which singer was associated with McDonald's “I'm Lovin' It” campaign at its 2003 launch?

Justin Timberlake was associated with McDonald's “I'm Lovin' It” campaign at its 2003 launch.

Timberlake recorded and performed the song connected with the campaign, helping give the advertising a recognizable contemporary pop presence. The campaign was introduced internationally as McDonald's sought a unified modern identity for its marketing.

The phrase itself originated in a German campaign developed by the agency Heye & Partner and was later adapted for McDonald's worldwide use. Timberlake's role was connected to the musical and promotional presentation, while the slogan's development involved advertising and corporate teams.

This distinction matters because the campaign is sometimes described as if it were simply a Timberlake single. It was primarily a McDonald's advertising platform that used music, celebrity association, and a repeated verbal identity. The campaign became one of the most recognizable examples of a fast-food brand linking a slogan to a pop-oriented sound.