Katy Perry and Rihanna dancing in nightclub.

Rihanna and Katy Perry were photographed in high spirits at the club VIP box Zero21 Luxury, early on Friday (23), in Rio de Janeiro. The two singers are presented tonight at Rock in Rio 2011. Rihanna, who is in the country a week ago, has taken advantage to know some sights in the state capital, such as Ipanema Beach and Christ the Redeemer. She has performed three shows in Brazil: Sao Paulo, Belo Horizonte and Brasilia.