Guy Sebastian shows off impressive body transformation with side-by-side photo

Aussie Guy Sebastian propelled into stardom back in 2003 when he became the first ever winner of Australian Idol. 

Back then he rocked an impressive fro:

But now he's rocking impressive abs!

Guy has been hard at work sculpting a fit and fine physique at the gym for the past 8 weeks and has now shown it off on the cover of Men’s Health magazine.

The fitness regime consisted of dynamic aerobic resistance conditioning. 

This Guy is killllling it!