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If you’ve noticed the temperature rising, believe us when we say that it’s not just the August heat - these young pop stars are also to blame. The latest wave of young talent to come onto the scene have made us stop and take notice. So all this week we’re rounding up 30 artists that all have two things in common: Their music makes us want to crank up the volume, and they’ve yet to hit their 30s. Kicking off our countdown we’ve got a Bay Area raptress with a disdain for designer labels, an angelic Aussie and one Sparkle-y American Idol alum. See who’s kicking off our Hottest 30 Under 30 list in the gallery above, and stay with us all week as we count down to #1.