Who recorded the best-known vocal version of McDonald's “I'm Lovin' It” theme song?

Justin Timberlake recorded the best-known vocal version of McDonald's “I'm Lovin' It” theme song.

The campaign was introduced internationally in 2003, and Timberlake performed the vocal track associated with the advertising theme. The music helped McDonald's connect its long-running brand message with contemporary pop culture and a recognizable recording artist.

The phrase “I'm Lovin' It” became one of McDonald's most durable advertising lines. The campaign used a short musical hook that could be adapted across languages, markets, television commercials, and other media while retaining the same central identity.

People sometimes confuse the singer with the songwriters, producers, or artists involved in the campaign's development. Timberlake's connection is specifically his recorded vocal performance on the widely recognized theme, rather than sole authorship of every musical element.