McDonald's introduced the global “I'm lovin' it” advertising campaign in 2003.
The campaign was created as McDonald's sought a unified international marketing identity. It replaced the company's previous major slogan, “We Love to See You Smile,” and used the phrase across television, radio, print, packaging, restaurants, and digital advertising. The lowercase styling and upbeat tone were designed to make the message feel conversational and broadly adaptable across languages and markets.
The campaign is often associated with Justin Timberlake because he performed vocals connected with the advertising jingle, but the campaign itself belongs to McDonald's corporate branding rather than to a single performer. The phrase also became one of the company's longest-running global slogans.
A common mix-up is placing the launch in 2004, when the campaign was already expanding internationally. McDonald's began rolling it out in 2003, making that the key date in the slogan's branding history.