Earlier this week, a local publication claimed that the 36-year-old author and her radio host hubby were trying for a second baby and crossing their fingers it would be a baby girl.
However, the mum-of-one has since confirmed that two-year-old Sonny is set to remain an only child for the foreseeable future.
Instagram user Flicky23 shared her joy for the future Foster-Blake baby and commented under one of Zoe's photos to say congratulations.
"Can't wait to see Sonny's new sibling @zotheysay I'm so excited," she penned.
Quick to respond, Zoe quipped, "Don't believe a word! Complete stinking horse---- as usual."
The Wrong Girl author has spoken out about her desire to have more kids down the track, despite having a difficult first pregnancy, where she faced serious health issues including severe morning sickness, gestational diabetes and Ostetis Pubis.
But for now, Zoe is enjoying being a mum to Sonny as she balances her incredible career.
2016 has proven to be one of her best years yet with her beauty empire, Go-To, and her updated beauty bible Amazinger Face, reaching dizzying height of success.
On top of that, the TV adaptation of her hugely popular book The Wrong Girl is set to hit Channel Ten later this month.
“My new thing is to only do one thing well. I hate seeing myself stand [at the shops] and try and answer emails because I’m not doing either thing well," the star recently explained to Mamamia about how she manages her work-load.
“If you can’t do two things well at the same time, just choose one. And be true to that thing in that one little minute."
And she's not done taking over the world just yet.
"I like fiction, I like creating, I like newness so I'm always sort of looking around and I get so pumped. I honestly have about three business ideas a day that I want to do," she explained during her chat on Mamamia's I Don't Know How She Does It podcast.
As for her next book she says she has some ideas up her sleeve but it "may not be what you expect from me."
Watch Sonny's sweetest moments in the video player below! Article continues...
The couple adore being parents to two-year-old Sonny.
Hamish gushed about his little boy to TV Week, saying, "I can't believe how lucky we are to live with him. At least until he's 17 and gets sick of us squishing him and runs away!"
The radio host also spoke about the reason behind the sweet snaps he and Zoe share on social media, explaining, "He makes our day, every minute of the day, and if you can give someone a laugh or a smile, I've got no problem with that!"
So, while Zoe might not be expecting a baby just yet, she does have another toddler in the house, other than Sonny...
Of course we're talking about Hamish's hilarious alter ego, Rory the toddler, who recently appeared on The Bachelor.
Yep, it looks like Zoe has her hands full for the time being!