The couple, who announced their engagement late last year, were married at Richmond Register Office in south west London.
The BBC star and her new husband (the son of Rolling Stones legend Ronnie Wood) have been dating for three years and already have a 15-month-old son Rex.
And their reception included a star-studded guestlist including BFF, Irish tv presenter Amanda Byram.
Fearne shared a snap of her first dance with her partner as they gazed adoringly at one another.
In another picture, she's beaming from ear to ear as she holds a glass of champagne.
Cotton wore a short-sleeved white gown, thought to be by Pucci, with a sequined detail around the neckline. The radio host also wore strappy stilettos and a jewelled headband.