 These include reggaetón singer Ivy Queen, who currently has seven top-ten, two of them number-one singles, Nina Sky, who appeared on Tony Touch's "Play That Song", Latin pop singers Shakira and RBD, and American R&B singers Beyoncé Knowles, Cassie, and Keyshia Cole.Ivy Queen became the first woman to top the chart in 2008, when her single "Dime" reached number one.Jennifer Lopez is the female artist with the most number-ones, with four.