Lucy is starring In the gymnastics reality series alongside a host of celebrities, including Girls Aloud's Sarah Harding and Steps' Ian 'H' Watkins, and they have been busy training over the past few weeks.
Earlier today, however, Lucy and the gang took a break from all the blood, sweat and tears to film the promo for the programme, which will air on BBC One.
Lucy posed for a selfie with fellow contestant and professional boxer Carl Froch and admitted that they'd been having a few giggles about 'pejazzles' off set. Ooh err!
"Filming the Tumble advert," she tweeted. "Casually talking about pejazzles with @Carl_Froch .. Normal day!!!"
We're pretty sure Lucy's going to go far in Tumble, as she is a bit of a fitness queen these days. Since quitting TOWIE, Lucy has been running her own 'Bootycamps' and has her own exercise and healthy living website, Results With Lucy.
On the weekend, Lucy took part in a fitness photo shoot and showed off her rock hard abs in a behind-the-scenes selfie.
Watch out Tumble guys, Lucy looks like she's going to be one to beat!
Will you be tuning into Tumble? Tell us below, as the best comment from across the website each week wins £50!