Hanson were approached about revamping their 2017 holiday tune Finally It's Christmas with Mike for his new album, Reason for the Season, and brothers Taylor, Zac, and Isaac jumped at the opportunity.
"They (label bosses) were like, 'Mike likes your song, and he'd like to sing it on the record,' and we're like, 'Well, duh!'" smiled Isaac during a joint appearance on U.S. breakfast show Today.
The project also helped to bring the siblings' careers full circle.
"We're still pinching ourselves (over the collaboration)," he beamed.
Reworking Finally It's Christmas with Mike also granted Hanson the chance to join the veteran musician in the studio to cover one of The Beach Boys' old hits, It's OK, which was released over the summer (18).