'My little nudey rudey munchkin Daisy Belle,’ she captioned the photo.
Another snap with her first child Trixie Belle sleeping next to Daisy was also posted with the caption, 'It’s exhausting being a big sister’.
After announcing her second pregnancy in February, Fifi has been candid about the IVF journey which allowed her to carry Daisy who was conceived via anonymous sperm donor.
Trixie, now six-years-old, was fathered by former iron man Grant Kenny.
The star is thought to maintain a friendship with Trixie’s father, who remains involved in the child’s life.
WATCH: ADORABLE! HOW FIFI TOLD HER DAUGHTER SHE IS PREGNANT!