Her son sported a large bandage over his forehead, receiving medical treatment in a hospital in the US while the family is there on vacation.
"Today I learned my 3 year old is way braver than me - (Dw guys he is fine)," Hembrow captioned the photo.
"OMG!!!!! What happened???" one fan wrote.
Tammy shares her son Wolf and daughter Saskia with ex-fiancé Reece Hawkins. The pair split last year after four years of dating.