“I'm Lovin' It” is the global McDonald's campaign launched in 2003.
The campaign was introduced internationally as a unified brand platform, using the lowercase phrase and the “ba da ba ba ba” vocal hook. McDonald's developed the campaign with the advertising agency Heye & Partner, and the song connected the slogan with a pop-oriented sound designed for worldwide recognition.
Justin Timberlake recorded a vocal version associated with the campaign, while the production and songwriting involved a wider group of contributors. The advertising was adapted for different countries, but the phrase and hook provided a consistent identity.
A frequent misunderstanding is that the campaign was simply a renamed version of the 1971 slogan. It was a new global branding strategy, created more than 30 years later. Its lowercase styling and short musical signature became especially important parts of McDonald's contemporary visual and audio identity.