Which singer performed the vocal version associated with McDonald's 2003 “I'm Lovin' It” campaign?

Justin Timberlake performed the vocal version associated with McDonald's 2003 “I'm Lovin' It” campaign.

The campaign used the phrase as a global McDonald's branding platform and paired it with a pop-oriented musical identity. Timberlake recorded and performed the vocal version connected with the campaign, bringing a prominent contemporary music presence to the advertising launch.

The underlying jingle was created through a collaboration involving Pharrell Williams and the German production team Mona Davis. That collaboration is why Pharrell is sometimes named when people ask about the campaign's music, but Timberlake is the performer associated with the vocal version.

The campaign phrase became one of McDonald's most recognizable modern slogans. It replaced the chain's earlier long-running advertising themes and was adapted for use in markets around the world.