Which singer performed the original vocal version used in McDonald's “I'm Lovin' It” campaign?

Justin Timberlake performed the original vocal version used in McDonald's “I'm Lovin' It” campaign.

McDonald's launched the campaign internationally in 2003, using the phrase as a global brand platform. Timberlake's vocal performance helped connect the advertising with contemporary pop culture and gave the campaign a recognizable musical identity.

The campaign is sometimes confused with the song's songwriting and production credits. Timberlake performed the vocal, while the broader project involved other music-industry figures, including Pharrell Williams and the Neptunes.

“I’m Lovin’ It” became one of McDonald's most enduring modern brand lines. Unlike a one-season promotion, it was used across countries and advertising formats for many years.