Perhaps hinting that she is back at work filming Eastenders, Jac captioned the snap: 'It's too early for clothes!! Onsie it is!! (sic)'
The star had just hours before shared a motivational message with her 170,000 followers, posting an Instagram picture that read: 'If you really want to do something, you'll find a way; If you don't, you'll find an excuse.'
Jacqueline announced last month that she is expecting her first child with TOWIE hunk Dan Osborne, much to the public's surprise.
The couple have been dating for a number of months, with 23-year-old Dan having a son, Teddy, from a previous relationship with Megan Tomlin.
Just three days ago, 21-year-old Jacqueline shared her very first 'bump' snap, showing the slight curve of her belly as she relaxed on holiday.