She is the latex-wearing pop princess behind I Kissed A Girl. He is one of the Britain's most outspoken comedians.
Both have a penchant for the grand and flamboyant gestures. But Russell Brand had a surprising admission to make this week about his wedding to the Katy Perry – they want to "keep it very normal".
The 35-year-old told presenters of the US TV show The View: "We just love each other and we want to get married in front of our friends and family and keep it very normal.
"It ain't about selling the pictures, it ain't about doing no pre-nup, it's just a normal thing".
This might come as a surprise to the fans who are familiar with their quirky personalities, and love of all things theatrical.
Indeed, their whirlwind courtship and Russell's impossibly romantic proposal in India – four months after they began dating – are anything but normal.
Though they're keeping the exact details of the ceremony under wraps, the couple are widely reported to be marrying in India at the end of the month.
Insiders close to them say they are planning a lavish six-day bash in the India – including a traditional Indian ceremony in Rajasthan.
Guests - who will include Katy's best friend Rihanna and probably Russell's pals David Walliams, Noel Gallagher, Jonathan Ross and David Baddiel - will apparently be flown out on private jets and sleep in deluxe tents.
As for the entertainment, Russell's favourite artist Morrissey has reportedly been invited to sing at the nuptials. Slightly different from your average wedding disco.
