The former TOWIE star turned online fitness guru after leaving the ITV2 reality show last year and has the figure to prove it!
The stunning 22-year-old, who now runs her own online fitness programme Results With Lucy, has transformed her figure from slim to super-toned - and even won best celebrity body in Reveal's 2013 survey.
So it's no wonder the sexy star is happy to show off her killer body on social media!
Alongside a selfie of herself in a cerise pink workout bra and dark patterned pants, Lucy wrote: "Behind the scenes!!! #Selfie #fitness #shoot."
In the photo, Lucy's taut stomach takes centre stage, but she's also showing off her perfect hair and pout! We're well jel!
Lucy - who is the face of sportswear Ellesse - also shared a selfie from the set of Tumble, the new BBC entertainment show in which "celebrities will vault, tumble and flip head-over-heels in a bid to win the public's votes".
The black and white photo shows a bare-faced Lucy smiling next to her partner and coach.
Next to the picture, she wrote: "Tumble training week 4 complete!! Lots of ups & downs this week.. But we are all still smiling!! Love my team @billyjacques & coach Katie bring on next week!!! #Tumble #NoMakeup #Selfie #BBC #TeamLucy."
World boxing champion Carl Froch, Girls Aloud star Sarah Harding, fitness legend Mr Motivator, EastEnders actor John Partridge and Loose Women host Andrea McLean are also taking part in the new series.
Are you looking forward to watching Lucy Mecklenburgh in Tumble? Tell us what you think below! Our favourite comment from across the week wins £50!