The former TOWIE star looked sensational as she braved the cold and posed up a storm on the red carpet in Leicester Square.
Her sheer gown revealed plenty of flesh which enabled her peachy rear to be on full display as the cameras flashed on her pert behind.
The stunning frock was embroidered with white flowers and fortunately the black bodysuit underneath made sure she kept her modesty, avoiding any wardrobe malfunctions.
Lucky Mecklenburgh flashed her derriere and cleavage at the Fifty Shades Darker premiere
Fifty Shades Darker premiere: Rita Ora flashes MAJOR underboob
Fifty Shades Darker premiere: Olivia Cox nearly suffers NIP SLIP
Lucy looked stunning on the red carpet at the film's premiere
The former TOWIE star flashed her peachy rear on the night
Lucy, 25, also went braless in the floor-length gown that featured an extremely low neckline and flaunted plenty of cleavage.
The see-through frock perfectly highlighted her gym-honed body and she certainly would have raised temperatures among the crowds.
The fitness fanatic dressed for the occasion and matched the theme of the film which is based on the erotic romance novel of the same name.
She kept her short locks in loose waves and left her make up-minimal drawing more attention to her phenomenal figure.
The movie’s leading lady, Dakota Johnson stunned in a monochrome gown as she attended the premiere with her on-screen lover Jamie Dornan who looked dapper in a grey suit.
Get Quotes on Home Insurance
Lucy went braless for the big event in London
Fifty Shades Darker: Jamie Dornan and Dakota Johnson in steamy trailer
Thu, December 8, 2016
It's been more than a year since the first Fifty Shades of Grey movie hit screens and fans have been given a glimpse of the sequel, in the seriously steamy trailer.
1 of 15
The main stars of the night Dakota Johnson and Jamie Dornan looked incredible at the London premiere
Dakota, 27, is reprising her role as Anastasia Steele for the Fifty Shade’s of Grey sequel with Jamie, 34, playing Christian Grey once again.
The follow-up to 2015’s hit will show Christian try to entice Anastasia back into his life but as their romance resumes, the wealthy businessman’s past threatens to tear them apart.
Fifty Shades Darker is in cinemas now.