American singer Justin Timberlake has embarked on five concert tours during his solo career, three of which have been worldwide and two of which have been collaborative. His 2003 debut The Justified World Tour began at intimate gigs at clubs and theatres in the United States and Australia before expanding to arenas in Europe. In summer 2003, Timberlake and Christina Aguilera headlined the Justified/Stripped Tour. Later that year he recorded a song "I'm Lovin' It", used by McDonald's as the theme to its "I'm Lovin' It" campaign. The deal with McDonald's earned Timberlake an estimated $6 million. A tour titled Justified and Lovin' It Live was included with the deal, following his initial Justified World Tour. For the release of his sophomore record FutureSex/LoveSounds, Timberlake embarked o