The 33-year-old shared a fresh-faced selfie on Instagram, glowing as she counts down the arrival of her second child.
She wrote: "Little man got me up at 5:15 am today. My eyes still haven't got the message. Morning all! [sic]."
Fearne and husband Jesse Wood are already parents to two-year-old son Rex, and last month they celebrated their first wedding anniversary.
The former Radio 1 DJ shared some sweet throwbacks from their big day to celebrating, gushing over her husband.
Alongside one, Fearne wrote: "1 gorgeous year of marriage to this amazing man. Lucky me!! [sic]."
It was also her father's birthday, and she posted a photo of him reading his speech at her wedding.
She said: "Also happy birthday to this dream boat, my dear Pops!! This time last year you were preparing for your brilliant speech. We love you so much! [sic]."
Earlier this year Fearne opened up about pregnancy the second time around, and admitted she's not fussed whether they have a girl or another boy.
She told Hello! magazine: "I think it's amazing how much you forget what i's like. You get to the point where you think, 'Oh God I forgot this happens and this happens', but then you remember to take it easy and rest as much as you can.
"I will be happy with either. I have a step daughter [Jesse's daughter, Lola] so I have that lovely scenario anyway. I just feel lucky to be pregnant again."