Those Hanson boys -- Isaac, Taylor and Zac -- have gone from "Mmmbop" to Mmmhops. Hey, they are all legal now and celebrating the band's 21st birthday. And what better way to have fun than brew your own beer?

Mmmhops will be brewed in partnership with Mustang Brewing, a craft beer company in the Hansons' home state of Oklahoma. They'll roll out the barrel in conjunction with the band's fall "Anthem" world tour. The brau will come out ahead of schedule and proceeds will go to the Red Cross' tornado relief efforts in the Sooner State.

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"The tragedy hits close to home, especially since this community was among the first places our band performed together, including schools which were lost in the storm. We are hopeful that the proceeds we can galvanize will play a lasting role in the recovery efforts," Taylor Hanson -- the middle one -- said in a statement.

The band introduced the new brew at the recent L.A. premiere of "The Hangover Part III," which included the trio's now-classic "Mmmbop" in the film. On that note, all we can say is, oh, brothers.