Everybody starts somewhere — even pop icons.

Beyoncé's been slaying since Destiny's Child dropped "No, No, No" twenty years ago, and she's still slaying now: her critically acclaimed Lemonade was the best-selling album of 2016. Katy Perry emerged in 2008 with the cheeky "Ur So Gay." That song hasn't aged well, but Katy has: she's gone on to become one of pop's top-earning artists. Britney Spears took pop to school in 1998's "...Baby One More Time." Brit's career renaissance led to her killer Las Vegas residency.

Find out where even more of pop music's top performers first started in the newest installment of PopCrush 360 up top.

Then + Now: '00s Teen Heartthrobs:

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