Pop brothers Hanson shocked music fans when their smash hit MMMBop took the world by storm 25 years ago and they did the same during a rare appearance in the Perth Live studio on Friday afternoon.

Brothers Isaac, 41, Taylor, 39 and Zac, 36 looked unrecognisable as they told host Oly Peterson how their lives have changed since the 1997 release, which turned the American trio into heartthrobs and household names.

Six albums and 15 kids later, the group is in Perth for their new tour, each writing five songs for their new album Red Green Blue.