In today's 'making you feel old' news, Zac Hanson has just turned thirty.

The singer made his musical debut in the MMMBop video back in 1997 – yup, that's almost twenty years ago.

He was 12 at the time, but was already playing the drums like a pro. Now though, the youngest Hanson brother is celebrating a landmark birthday, and we're feeling pretty ancient.

Zac, Taylor and Isaac appeared at a charity event earlier this week, but you'd be forgiven for not recognising them… 

Gone are the long blond locks and baggy jeans, replaced with shorter cuts and much cooler clothes. 

Is it wrong that we're mildly attracted to little Zac?!

As a 30-year-old father-of-three, he's definitely not so little any more, though. In fact, the Hanson brothers have 11 kids between them – Isaac has three kids with wife Nina Odette and Taylor has five with wife Natalie Bryant.

Hanson might be forever remembered as teenager crooners in our eyes, but the trio have actually gone on to be pretty prolific musicians since their Nineties debut.

They've had a whopping ten studio albums in total, and are currently gigging across the US on their Roots Rock N' Roll tour.

That's great and all, but we're content to listen to this on repeat: