Britney Spears will make her second appearance at the Rock in Rio music festival, but this time in the Portuguese capital instead of Brazil. The 22-year-old pop singer is set to perform on June 5 at the 2004 festival, being held at Bela Vista Park in Lisbon. She was among the acts at 2001’s Rock in Rio, held in Rio de Janeiro. The festival will take place between May 29 and 30 and June 3 and 6. Several other high profile artists, including Sting, Alejandro Sanz, Metallica and Guns N’ Roses will also perform. Spears will use the event to promote her latest album, In the Zone.