"It's going to be indulgent, right? Everyone's going to be topless, the bride, the groom, that's me, our parents, all topless. It will be a festival of decadence," Brand told Parade Magazine.
"The first thing we're going to do is slaughter a swan. That's to the god Zeus. Our wedding is essentially going to be a recreation of the greatest moments in mythological history."
Brand, a onetime philanderer who won The Sun newspaper's "Shagger Of The Year" award from 2006 to 2008, said he is now prepared for married life.
"I didn't choose monogamy. Monogamy chose me," Brand says. "I feel excited to be marrying such a lovely girl. I am now officially engaged because love made me crazy. It's a big brain trick. Love is the universal migraine. It's peculiar and insane to be monogamous, to have just one woman. I keep thinking there must be a loophole in this deal somewhere. But, the good thing is that because Katy loves me, I'm being a good boy."