Following her weekend of partying (Jess joined the Kelly Brook at her London bar Steam and Rye on Saturday night), the reality star told her Twitter followers she was re-starting her detox on Monday.
And as well as stocking up her fridge with goodies CBB's Gillian McKeith would be proud of, Jess decided to put her body through its paces and joined her trainer for a tough workout too...
Although, we're not quite sure how she managed to not even have a hair out of place while doing so. Tips please!
Working out turns us into a sweaty, red-faced mess, but not Jess, she couldn't have looked cooler as she stormed her way through sprints in the park, press-ups and squats. Just check out those abs.
Providing us all with a little motivation to get our bums down to the gym, Rogan O'Connor's former flame looked pretty incredible as she flaunted her figure in a blue sports bra and matching shorts.
Following her gruelling training session, Jess tweeted: "Mad session @SilvermereFit thanks @WesSantos1 for almost killing me off! #detox."
But despite admitting she found it pretty tough, she was still pictured rocking a smile all the way through. Good effort!
Reveal recently caught up with Jess and uncovered all her beauty secrets, to steal them for yourself click here.
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