Top 20 Countdown: Jim Shearer + Mike Adam Talk About The Evolution Of Nick Jonas

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This week on Top 20 Countdown, host Jim Shearer and correspondent Mike Adam explain what worked and what didn't for Nick Jonas' career leading up to his current success.

Are you loving the new Nick Jonas? Click through the gallery to see the exact moment Jonas went from teen star to grown and sexy.

Nick Jonas

[Photo: Getty Images]

Nick Jonas

[Photo: Getty Images]

Nick Jonas 2008

[Photo Credit: Splash News]

Nick Jonas

[Photo: Getty Images]

Nick Jonas

[Photo: Getty Images]

Nick Jonas

[Photo: Getty Images]

Nick Jonas

[Photo: Getty Images]

Nick Jonas shirtless selfie

[Photo Credit: @nickjonas]

Nick Jonas

[Photo: Getty Images]

Nick Jonas hot 2013

[Photo Credit: Splash News]

Nick Jonas

[Photo: Getty Images]

Nick Jonas 2014

[Photo Credit: Getty Images]

Nick Jonas hot 2014

[Photo Credit: Splash News]

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