Taking to the photo sharing platform, the 41-year-old shared a selfie with her quarter of a million followers showing off her radiant glow while she relaxed in bed.
"My favourite part of every week-day is picking Trixie up from school.
"My second favourite part is NAP TIME!!! Night-night everybody," she captioned the shot.
Fifi is already mum to five-year-old Trixie who she shares with her ex, former Aussie Ironman Grant Kenny.
The radio presenter has long been open about her love of motherhood and her social media feed is littered with photographs and loving captions about her young daughter.
Last week the little girl delighted Fifi's co-host Brendan Fevola by breaking news of the pregnancy in the sweetest way imaginable.
"Mummy's having a baby," Trixie whispered in the former AFL star's ear, prompting him to exclaim: "Are you really? That's amazing - you're going to have a little brother or sister, oh my God that's amazing!"