Age: Ally Brooke, 21; Dinah Jane Hansen, 17; Camila Cabello, 17; Normani Kordei, 18; Lauren Jauregui, 18
Star power: This dynamic girl group was formed on the second season of The X Factor. After coming in third place they signed a joint deal with Syco Music, owned by Simon Cowell, and Epic Records, L.A. Reid's record label. Their first EP out last year debuted at No. 6 on the Billboard 200 and they've since opened for Demi Lovato and Austin Mahone. Earlier this year, they announced a multi-year partnership with Mattel's Barbie brand, including a brand anthem, and a line of Barbie dolls featuring the five members to be unveiled over the course of this year.