The popstar and his wife revealed in May that they are expecting a baby girl.
Williams uploaded the picture of Field in their LA home yesterday evening (June 29) along with the caption "My two girls!"
It has been reported that the 'Feel' singer is keen for his daughter, due in September, to be born in the UK. Sources have also claimed that he has gone so far as to pre-book an elective Caesarean section for Field in a top London clinic.
Williams recently returned to LA following appearances at the Queen's Diamond Jubilee concert celebrations and Unicef's Soccer Aid, where his England team beat The Rest of the World 3 - 1.
Watch Robbie Williams talking about this year's Soccer Aid below: