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She recently revealed on Instagram she had dropped two dress sizes by taking Slim Fast meal replacements shakes three times a day.
And Kelly Brook continued to work on her fitness as she was spotted exercising with boyfriend Jeremy Parisi in Kent on Sunday.
Radio - Presenter - Curves - Crop - Top
The radio presenter, 39, showcased her enviable curves in a pale grey crop top and black leggings as she worked up a sweat during the gruelling exercise session.
The star teamed her gym attire with black trainers as she threw herself into the fitness routine.
Brunette - Ponytail - Beauty - Workout
Kelly swept her brunette tresses into a neat ponytail and showcased her natural beauty by going make-up free for the workout.
Meanwhile, Jeremy kept things simple in a black vest, black jogging bottoms and black trainers.
Couple - Year - Picture - Concentration - Session
The couple, who celebrated their fourth anniversary earlier this year, were the picture of concentration during the session.
They were seen doing an array of stretches on exercise mats, with Kelly even showing off her flexibility with a Downward Dog move.
Kelly - Jeremy - Work - Treadmill - Couple
Kelly and Jeremy were then seen putting in the work on the treadmill and the loved-up couple still found time for giggle as they ran.
The couple's workout comes days after Kelly updated her fans on her progress, explaining that she'd gone down from a size 16 to a 12.
Instagram - Week - Followers - Dress - Sizes
Posting on Instagram last week, she told her one million followers: 'So happy to announce that I've now gone down 2 Dress Sizes with #SlimFastUK and I'm back to feeling...
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Sorry Mr. Franklin, we couldn't keep it.