For Cheryl, it's been a stellar rise from '00s reality TV hopeful to global icon. She started out as one fifth of Girls Aloud, the pop fivesome who'd go on to give Spice Girls a run for their money. But after a guest spot on will.i.am's 2008 single “Heartbreaker” and a band hiatus a year later, Cheryl launched her solo career in earnest via her smash debut album, 3 Words. Get familiar with her solo hits here.