The former TOWIE star, 24, who owns a successful fitness and nutrition brand, is among the celebrities taking part in what has been called "the toughest physical and mental challenge on TV" - L'Etape du Tour in France.
The race allows amateur cyclists to race the same route as a Tour de France stage.
Lucy will be competing alongside model Jodie Kidd, Made In Chelsea's Hugo Taylor, rugby star Austin Healey, Olympic gold medallist Amy Williams, cricketer Darren Gough, journalist Angellica Bell, and dance Louie Spence.
During the four-part series, we'll see the celebrities being trained by top coaches, taking part in 'team bonding' events such as aerial yoga, aqua cycling and Tough Mudder.
Before the big race, they'll test their skills at warm-up events including the Bostin Peaks cycling sportive and the White Rose Classic.
All the celebrities will have a Diary Cam, so we'll get an intimate look at their preparations for the big day, and how they're really feeling about the race.
The coaches are Dame Sarah Storey OBE, Britain's most decorated female Paralympian, Rob Hayles, a three-time Olympic medallist and double Track World Champion, and Asker Jeukendrup, an internationally renowned exercise physiologist, sports nutritionist and Ironman tri-athlete.
This year's L'Etape du Tour will take place on the north edge of the alps, according to Cycling-Challenge.com, and will cover 146 km, with four big climbs.
Tour de Celeb will air on Channel 5 soon.