The daughter of Phil Collins, 66, pulled out all the stops and looked incredible on the red carpet at the premiere of Okja.
Wearing her tresses down in a sleek style, the 28-year-old flashed plenty of décolletage in her show-stopping white gown.
Lily showcased her toned pins thanks to the breathtaking frock, complete with a daring thigh-high slit.
The actress’ look also featured a dramatic train, stunning embellishment and an off-the-shoulder neckline.
Not content with the sparkly detailing, Lily added a diamond necklace, towering pair of metallic heels and coordinated eye make-up.
She was seen posing with the likes of Tilda Swinton, Jake Gyllenhaal and Paul Dano on the steps before the screening of the blockbuster drama.
Lily played Red in the Bong Joon-Ho-directed movie about a girl who risks everything to stop a multinational company from kidnapping her best friend – a basic, hippo-like animal.
Film star Tilda, 56, also chose the same hue as her co-star in the form of a stunning futuristic dress.
Meanwhile, also in attendance was Rihanna, Jessica Chastain, Juliette Binoche and Aishwarya Rai Bachchan, who stopped traffic with her ensemble.
The Bollywood actress’ voluminous blue dress with a huge billowing skirt took up a lot of space as she pouted at photographers.