It was ironic ... one of the couples invited to the coveted State of the Union address last night at the U.S. Capitol was Willie and Korie Robertson -- to bring DIVERSITY to the event!
The "Duck Dynasty" stars were invited by Congressman Vance McAllister -- he's a Republican from Louisiana who won a close race last year, and the Robertsons helped with their endorsement.
Now here's the best part ... McAllister said he invited them to bring "some diversity to our nation's capitol."
Diversity is a tricky subject for the Robertson family ... who apparently thinks gays will burn in hell and homosexuality is a gateway to bestiality.
We're guessing they didn't ask Jason Collins for an autograph ... or vice versa.