Who provided the featured vocals for McDonald’s 2003 “I’m lovin’ it” song?

Justin Timberlake provided the featured vocals for McDonald’s 2003 “I’m lovin’ it” song.

The song was created for McDonald’s global advertising campaign launched in 2003. Timberlake’s vocals helped turn the campaign’s musical theme into a recognizable pop-oriented brand sound, while the phrase became McDonald’s long-running advertising tagline.

The campaign’s music was connected with producer and songwriter Pharrell Williams, which creates a frequent attribution mix-up. Williams was involved in writing and production, while Timberlake performed the featured vocals heard in the song associated with the campaign.

The phrase became especially durable because it functioned in two ways: as a song hook and as a concise expression of customer enjoyment. McDonald’s continued using “I’m lovin’ it” across international advertising, making the campaign one of the company’s most enduring modern branding efforts.