Britney Spears

This lady needs no introduction. She rocked the world in the early 2000s with great music albums like 'Baby One More Time', 'Oops!… I did it Again' etc.   Britney Spears and Australian rapper Iggy Azalea recorded 'Pretty Girls' in 2015. Though the song didn't perform as expected, it certainly brought 'Blackout' star and mum of two back into the business. 

First Picture: Baby One More Time (Baby One More Time Album), 1999

Second Picture: Pretty Girls (Single), 2015