Who performed the featured vocals on McDonald’s “I’m Lovin’ It” advertising song?

Justin Timberlake performed the featured vocals on McDonald’s “I’m Lovin’ It” advertising song.

McDonald’s launched the “I’m Lovin’ It” campaign internationally in 2003. The campaign used a short musical hook associated with Timberlake, who was then a prominent pop performer following his work with NSYNC and the beginning of his solo career.

The slogan and the song are related but not identical: McDonald’s used “I’m Lovin’ It” as a global brand line, while the musical recording supplied the campaign’s recognizable sound. The phrase was adapted for advertising in multiple markets.

A common mix-up is to identify the song only with Timberlake’s later pop releases. Its role here was commercial branding, and the campaign helped McDonald’s create a more unified international identity after years of market-specific slogans.