The 26-year-old supermodel took to picture-sharing site Instragram to announce she is expecting her first child with her husband James Conran.
She wrote: "We are absolutely thrilled and elated to announce that after four years of marriage we are expanding our family and expecting our first child spring of 2015!"
The model posted the news along with a video of herself in a nude leotard showing a hint of a baby bump and featuring the words, 'Baby Conran arriving spring 2015".
The couple - who tied to the knot in 2010 - are yet to reveal whether they are expecting a boy or a girl.
Meanwhile, Coco's mother Rocky has already assured the pair that her future grandchild won't be referring to her as 'grandma' as it’s too old fashioned.
Coco explained: "They have to call her by her first name. I think this is a new thing, women not wanting to be called grandma."
Rocky added: "I'm old in skin, but not in my thinking."
Irish Canadian Coco Rocha has taken the fashion world by storm with an unforgettable face, modish look and vivid persona. Her career began at the age of 14 when agent Charles Stuart spotted her at and Irish dance competition.
Rocha said she wasn’t interested initially but Stuart persisted. She told IrishCentral some years ago “He would come to every competition, or he would have some lady come up to me and say, you know, ‘He is legit, try it!’ So a year later I decided to do it, see what it was like — and now here I am today. If it weren’t for my Irish dancing, I wouldn’t be modeling.”