The two hottest females on the chart right now are taking their act to the 2014 Billboard Music Awards.
Ariana Grande and Australian rapper Iggy Azalea have joined the lineup for the show. The two will team for a performance of Ariana's new hit, "Problem," which features Iggy, while Iggy will do her own smash, "Fancy." Both songs are currently in the top 10 on the Billboard Hot 100.
Other performers on the 2014 Billboard Music Awards, which air this Sunday night live on ABC, include Imagine Dragons , Jason Derulo , Jennifer Lopez , John Legend , Lorde , Miley Cyrus , OneRepublic , Pitbull , and Ricky Martin .
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