Former TOWIE star Jess was papped on the red carpet at the glitzy event, held in London, and she was showing off her figure in an all-white ensemble.
Jess opted for a wide leg jumpsuit, by celeb fave House Of CB, and she teamed it with a pale gold shoulder bag and matching sandals.
The star wore her hair in a simple low ponytail and she topped off her look with a nude lip and a good flash of bronzer.
As she headed out of the door, Jessica tweeted: "En route @CosmopolitanUK #FashFest."
Cosmopolitan's #FashFest coincides with London Fashion Week and is hosted by Emma Willis. Those lucky enough to be on the guest list are being treated to an inside peek at all the new A/W16 season looks and accessories from our high street faves.