Edited sentence: Confirmed by organizers, the Rock in Rio performance is Spears' was the only international booking, but will be part of a bigger itinerary.In Brazil, Spears had set her first international performance date of 2004 with a June 5 stop at Portugal's Rock in Rio-Lisbon festival.On January 24, Spears' presented Madonna with a career achievement award at France's biggest music awards, hosted by European radio group NRJ.She also performed her second single from the album" Toxic"