Isabella Rossellini, Lupita Nyong'o, Julia Roberts, Penelope Cruz, Kate Winslet, Paris Fashion Week Haute Couture

David M. Benett/Dave Benett/Getty Images for Lancome

Talk about a starry night in Paris!

Celebs stepped out for the Lancôme "WÔW" 80th anniversary party in the City of Light on July 7, including four of the brand's Oscar-winning ambassadors: Lupita Nyong'o, Julia Roberts, Penélope Cruz and Kate Winslet all attended the fête, and served us a healthy dose of glam while they were at it (naturally). Lupita turned heads in a glimmering Prada number, while Julia went for a sexy all-black shorts suit. Penelope, meanwhile, opted for black-lace Emilio Pucci confection, which became contender for best LBD of the night next to Kate's Azzedine Alaïa fit-and-flare design.

Lauded Italian actress Isabelli Rossellini also made an appearance, sporting a trim black tuxedo with Chanel pearls.

Lily Collins, Chrissy Teigen, John Legend, Michelle Rodriguez

Stéphane Feugère for Lancôme

Other stars celebrating Lancôme's diamond anniversary included Lily Collins (who stunned in lacy Mikael D design featuring a high-low hem), Chrissy Teigen and handsome hubby John Legend (we gather this was pre-butt display) and Michelle Rodriguez (who kept it classic in a plunging black gown).

Kylie Mingue, Lily Donaldson, Petra Nemcova

Stéphane Feugère for Lancôme

The party got (red) hotter with models Lily Donaldson and Petra Nemcova in attendance, while singer Kylie Minogue opted for a one-shoulder crimson mini.

Isabella Rossellini, Lupita Wyong'o, Julia Roberts, Penelope Cruz, Kate Winslet

AP Photo/Kamil Zihnioglu

Yep, we'd say the star power in the room was pretty impressive.

Who wore your favorite look last night?
PHOTOS: Stars at Paris Haute Couture Week fall-winter 2015

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