Happy Birthday, Bruno Mars! Watch Him As A 4 Year Old Impersonating Elvis [VIDEO]

Happy Birthday, Bruno! 

Sure, at age 28 (today's his birthday), Mars is a mega-superstar. But this video proves he didn't just step out of the middle of nowhere and start singing.

This video is from when he was 4 years old and the world's youngest Elvis impersonator.

In fact, it also landed him a performance role in Honeymoon in Vegas.